A/N: Heyyyyyyy...-hides at a corner- I know I haven't updated most of my fan fictions yet but I don't think I can until I got this idea out of my head. /sighs If you're in my shoes, you would see that my brain is the most random thing you ever met. This actually continues right after 'Even After Everything' and that one-shot is on my profile right now. I posted this originally at AO3, so if you'd like to read it there, I have pasted the link in my profile. Besides that, I need to tell you that this is the deep brotherly bond/family Hidashi. Not the lovers pairing stuff. :) I also think this is like Not Dead!Tadashi with a twist...meh. /shrugs/ I'm not sure yet. So, hope you guys like this and review to let me know what you guys think!

Warning: This story is completed and so, this story is officially under family bond/brotherly Hidashi. Not incest Hidashi. :) [Note Edited: 24/3/2015]

Disclaimer: Not mine. Not even Tadashi's 'new' last name. Not mine. All right belongs to Marvel, the creators of BH6 and Disney as well as other respective productions and companies involved.

Decipher the Past

Chapter 1

The sky darkened slightly as he looked out of the window. Placing his hand against his right cheek, he sighed silently. The soft humming of the car was all that filled the small void inside. Nothing was exchanged as his tired eyes tried its best to stay open.

"Are you tired?" a silent, worried voice asked as he glanced at the woman next to him. She was the one driving this car, getting to their destination of the day. He just pulled out a smile before dropping it and hunched his shoulders forward a bit. Stretching his hands as far forward as he could, he mewled when the tired muscles were pulled. Looking back at her, he just shook his head, answering her question.

"Not really, Aunt Cass," he said carefully. She furrowed her eyebrows as she kept her eyes straight ahead on the road.

"Alright," she said finally after a few short seconds. Silence enveloped between them as he looked back outside of the window. Zooming past other cars, he noticed how the colours mixed and mashed before they turned into a steady stream of white nothingness. He felt his heart tugging at that thought, somehow realising that that was how he was feeling right now.

Blank, as if nothing mattered. The reality was crueller today even though nothing bad happened to him. Nothing bad had to happen to him anyway, he muttered darkly in his mind. It already did and now, they were on their way to pay respect to the aftermath of that said bad happening. His heart clutched tightly as the familiar dark feeling coiled deep inside.

Two years, it had been two years and yet, he still couldn't stop himself from feeling lost.

When he had gone back to San Fransokyo Institute of Technology (SFIT), he thought he had forgotten about this pain. But at night, when the loneliness would hit him hard, the dull ache would return. It wouldn't blur him like it did when he first lost his brother, but it was there. About a fraction of it still lived inside of him every day and he was sure, it wouldn't leave him no matter how long he waited this out.

"You're quite silent though," Cass said, jerking Hiro from his daydream as he looked at her. Leaning against his passenger seat with a sigh, he smiled.

"I don't have much to say, I suppose," he said, somehow still finding his deep voice a bit off. It had been almost a year or so since he had gone through puberty. It was like a whole mix-up of hormones and stuff and suddenly, he was no longer that fourteen year-old-boy. He was slightly taller than Aunt Cass but not as tall as Tadashi was if he was still alive. His hair was still as messy as he liked, sometimes irking Aunt Cass for its messiness. He would just laugh it off with a sassy comeback saying it attracted girls.

"Hiro," Cass continued, her voice sounding affectionate. "It's going to be alright, okay?"

"I know," he said, his smile faltered a bit before morphing into a grin. "Hey, I'm still saving the world, aren't I?"

Cass just chuckled, rolling her eyes at her nephew's words. The truth was, Big Hero 6 was quite inactive nowadays. It turned out that after the Yokai, or Robert Callaghan's scheme, San Fransokyo was quite a quiet place. There wasn't much heavy crime that the police couldn't handle. In the end, Hiro ended up spending his days inside of the 'nerd lab', fixing up his latest inventions and upgrading Baymax once in a while in the garage of the café.

"That's nice," Cass replied humourlessly as Hiro chuckled and looked back out of the window. "But seriously, Hiro. Everything's going to be fine, alright?"

Hiro just nodded, suddenly not being able to reply. It was fine all this time but for the future? He wasn't so sure. If he could change back time, he would've stopped his older brother from heading straight to his death or follow him, for the sake that he could end up with him wherever he was right now. But he knew deep inside that if his brother didn't die, then San Fransokyo would've been destroyed somehow.

It was one sacrifice for million others.

But it was still him dying.

It was still him leaving Hiro behind.

After he had fallen asleep hugging Baymax that morning, he thought he heard his brother's voice somewhere around him. Staying and watching him as Hiro slept. But when he woke up, he couldn't find anybody. Somehow, he had felt as if his life was going to change again and it shook him inside.

Pushing away the thoughts, he just remained focused for today. He needed to visit Tadashi first.

Tugging at his black jacket, he walked to his brother's grave with Aunt Cass following him. The wind blew gently against them as Hiro sighed and held onto his bouquet of white lilies tightly in his hand. As they neared the small engraved stone, Hiro felt the swirling negative emotions filling inside of him once again. Cass placed a hand on his shoulder before she gave it a small squeeze. Hiro smiled before he bent down a bit and placed the flowers in front of the stone.

"Hey, Tadashi," Cass said suddenly as Hiro chuckled slightly, his eyes growing blurry a bit. "Two years, huh?"

The wind howled gently, cooing in their ears, answering her question. Hiro felt goose bumps on his skin as he rubbed his arm slowly. Somehow, today the sky was being extra melancholy. "The café's going well, just so you know. Mochi misses you. That cat is—you know," Cass continued as she chuckled a bit. "God, Tadashi," Cass said softly, her voice scrunching deep in slight disappointment and sadness. "I miss you so much. Hiro misses you so much. Everybody misses you, Tadashi. I hope you're alright wherever you are."

Hiro felt the hot tears threatening to spill as Cass sighed loudly, her voice shaky. "I love you, Tadashi," Cass said finally, somehow unable to stop a few tears from escaping her eyes. Quickly wiping them, she turned around and looked at Hiro. "I'll see you in the car." Messing up his hair a bit, she walked away, leaving Hiro alone to stare at the tombstone.

"Hey," Hiro said softly. "I'm sixteen now."

He could imagine Tadashi's chuckle and that big goofy grin of his as he nods at Hiro. Hiro couldn't help but to laugh a bit as the tears finally slipped past his eyes and down his cheeks. Sliding down until his right knee touched the green grass, he sighed and gently placed his right hand on the soft mass of soil. Tracing it gently, he felt the heavy sadness growling inside of him.

"I miss you, Tadashi," he choked out the words. "I miss you so much that sometimes I get so angry at you. I wanted to yell at you for leaving me behind to save someone like—like Callaghan," Hiro spoke, the words coming out in rush anger and frustration. "I thought about even making a time machine and stop you from doing something so stupid like that but—but, your words echoed in my mind every time I tried to."

'Someone has to help.'

"Someone has to help," Hiro quoted his brother's last words to him before shaking his head gently and looking up from the tombstone and wiped his eyes. "But…as much as it pains me to see you like this…you did the right thing."

"I love you, Tadashi. More than you could ever know. I just wish I could say it to you one last time."

With that, he took in a huge breath of air and steadied himself before getting up. Patting on his knee, he sniffed a bit before looking back at the tombstone and smiling. "I'll see you soon, Nii-san."

With that he finally turned around and walked away, somehow feeling slightly better. Just ahead, he could see Aunt Cass, leaning against her car, waiting for him. Smiling at her, they both got into the car and drove off, heading back home.

Once he had reached home, he had quickly walked up the stairs to get to his room. He needed to change and head back to SFIT. He still had classes to attend to. Without missing a beat, he had pulled off his clothes and hurriedly changed into his blue worn out hoodie and black jeans. Taking his bag, he sighed before looking around his room and found his brother's cap. The only memento he had after Tadashi passed away.

Grabbing the cap and wearing it over his head, he quickly patted Mochi who was lazing around on his bed and rushed out of his room. Jogging down the stairs, he quickly spotted Cass, who was just fixing her dress before he headed to her and kissed her cheek. "I'll see you soon, Aunt Cass."

"Oh!" she said in surprise as she watched Hiro rushing out of the café. Shaking her head, she went ahead and opened her café for the public. Hiro dashed down the streets, trying his best not to get hit by random passing cars. He was still too young to get a car licence, so besides walking, he could take the bus. But he doubted there would be any busses to the institute right now, so he was left with running.

His hair was even messier and he was sure that he was sweating like some wet dog when he had finally reached to SFIT. He was panting heavily as he cursed himself inside for his lack of physique. He hated sports, with gleaming fire inside of him. He just didn't understand why some people enjoyed running for the sake of fun. It wasn't fun. Messing up your coordination and gaining more than enough lactic acid to poison an army inside of you was definitely not Hiro's definition for fun.

Shaking those thoughts out, he stiffly started to walk into the institute. He didn't have to take another step before he saw Gogo Tomago, riding her bicycle in high speed. Well, it wasn't really a bicycle, it was more like an electromagnetic ride. She spotted him as she passed him, quickly turning around and halting into a silent screech in front of him. Popping her bubble gum even after all these years, she looked at him with a silent smile.

"Hey, Gogo," Hiro said as he walked around her to get inside of the building. Gogo just followed him, getting off from the ride and dragging it next to her.

"Hey," she said quietly. "You visited him?" she asked, Hiro knowing full well to what she was implying. Hiro nodded as he sighed and fixed his bag so it hugged his shoulders a bit more comfortably.

"Yeah," he answered quietly as she nodded, still chewing the bubble gum.

"We're going to visit him later," she said as Hiro nodded. "Wasabi said to give the family the honour first."

"He's right," he agreed as he chuckled before looking at her. "Don't you ever stop chewing?"

"I do," she said uninterested with that insult. "I just choose not to now."

"Ha ha," Hiro said dryly as he rolled his eyes at her. They remained silent as they went into the institute, already heading to the lab they shared. The classes wouldn't start for another thirty minutes, Hiro noted, so he didn't see any problem by dropping into the lab for a while. It took them five minutes before Hiro reached the lab and walked in, already grinning like his usual self when he saw Honey Lemon trying to add some kind of chemicals into a flask and squealing when it turned light green to orange.

"Hey, nerds," Hiro joked as Wasabi waved.

"Hey, Hiro," he said as the younger Hamada walked to his small working station and placed his bag there before sitting on the comfy chair. Looking around, he noticed that Fred wasn't around. Raising an eyebrow, he wondered where this man could've gone. He was always with them and to find him not here, it felt a bit incomplete.

"Where's Fredzilla?" Hiro asked as Wasabi glanced at him and sighed.

"At home," he said. "He'll be here soon. He slept in, or something. You know, Fred."

Hiro laughed before he nodded and turned around to his table, noticing that there were some loose screws and metals lying around. "Huh," he said softly before picking up what seemed like a small box he created two days ago. He couldn't really figure out what to do with this. It was just something he created at the spur of moment, something that just popped into his mind at first and then gone by the next minute. He tried his best to make it work, but at the end, it remained as some useless box. It didn't intrigue him anymore, so he tossed it aside and opened up his sketch book.

Inside, he had drawn or sketched some of his inventions he wanted to create. It wasn't the best sketching technique but it was close second and he could at least make out the figure of the invention so he knew how the machine will look like when it was done. But somehow, today, he didn't feel like screwing around some random parts together.

He just wanted to look at the sketches and flip through the pages for more.

Suddenly, before he could react, a huge loud bang exploded inside of the lab, suddenly covering half of the lab in light orange colour. Hiro was so shocked that he ended up toppled out from his chair, landing flat on the ground on his back with the sketch book on his face.

"What was that?" Wasabi screeched as he looked at Honey Lemon, who was blinking at them, covered from head to toe in light orange. "Honey?"

"Oops," she said, not really sounding apologetic before she laughed. Something about that laugh always scared Hiro. That was not some normal type of laugh, it always reminded Hiro about one of those evil mad scientist laugh when something went their way.

"Honey," Gogo started, her voice sounding tight and menacing.

"It really worked though!" Honey exclaimed happily as she removed her goggles. Her eyes were bright and filled with happiness. "It's the latest invention to blind criminals. It usually just sticks to the outer part of the eyes and stays there."

"Woah, what?" Wasabi asked, somehow sounding less than excited. "That's scary!"

"Exactly!" Honey Lemon said as she looked around. "I'm still fixing the explosion radius though. But it worked nether the less."

"Honey, you coloured half of the lab in light orange and you're drenched in that stuff too," Gogo commented, sounding slightly agitated.

"Oh, well, don't worry," Honey Lemon said before she went to her now orange coloured desk and took another ball filled with what seemed like light green liquid. "Watch this," she said before she threw it against the wall and another loud bang filled the whole entire lab.

Hiro, who just happened to finally sit on the chair, had flung down on the floor again with that loud explosion. "This hurts!" Hiro exclaimed as he felt his back screaming in pain from hitting on the ground twice.

The light green that covered half of the lab somehow started to fade away, dragging away the orange colour and suddenly, everything in the lab was spotless as if nothing happened to it. Even Honey Lemon had looked sparkly. "It actually causes some kind of reaction together so that they evaporate into thin air simultaneously, leaving nothing but pure cleanliness."

Wasabi had looked as if he didn't know what to say meanwhile Gogo seemed mildly irritated. Hiro was groaning and mumbling darkly as he sat back down on his chair before the door to the lab flapped open widely, revealing Fred. "I heard some massive explosions in here," Fred said casually, his eyes wide and a huge grin filling up his face.

"Yeah! Let me demonstrate again!" Honey Lemon said before she took another orange coloured ball.

Before any one of them could protest, she had threw that ball against the wall, causing another huge bang. This time, Hiro made sure he stayed on the ground.

That was the best decision in his life so far.

Rubbing his neck, he walked out of the lecture hall tiredly. After the third time blowing the lab up with colours, Hiro had decided to escape and head to his classes. He just didn't expect some kind of audience outside of the lab, staring at him with worry and some with amusement. Wasabi was next to rush out in fear, scared that he would end up getting some of that orange thing into his eyes and going blind.

After that, the two of them tried to explain that what they heard was nothing dangerous. After trying to convince the said crowd that everyone was alright inside, Hiro had walked to his lecture hall, his back groaning at him.

He tried to focus during the class but he was somehow tired. The tiredness was making him lose concentration during class. So, he was glad when class finally ended and he ended up walking back to the café. Maybe he would ask Aunt Cass to make him some hot coffee or something. Shaking his head a bit, he jogged as he passed the busy streets and ended up at the familiar road pavement that brought him to the café.

Finally pushing open the café doors, he sighed loudly in happiness when he felt the familiar scenery greeted him back. "Aunt Cass? I'm back!" he yelled out as he heard some clattering from the kitchen. She quickly poked her head out from the kitchen and grinned widely.

"Welcome back, Hiro!" she said as he walked to one of the tables in the café and sat down with a slump, tired. "How was today?"

"Tiring," he replied dryly as he heard his aunt chuckling. "Hey, Aunt Cass? Can I have some coffee?"

"Yeah, okay, let me make some," Cass said back. Looking around, he noticed that some of the customers were busy eating and talking, enjoying Cass's pastries. He smiled softly to himself before leaning against the chair and stretching a bit. After this coffee, maybe he would get a good hot bath to calm his tense muscles. Seconds ticked on before he looked around, placing his right arm on the table and his hand holding his chin. His eyes were slightly droopy as he stifled another yawn. "Here you go, Hiro."

Cass placed the hot cup of coffee in front of him as he looked up to her and grinned. "Thanks, Aunt Cass," he said before taking it and placing his lips around the white rim. Cass smiled back warmly before she walked back to the kitchen, continuing with her job. The hot coffee slightly scalded his tongue as he took it away from his lips, hissing in pain.

Great, another pain, he muttered darkly in his mind as he poked his tongue out of his mouth, trying to get it to cool down. Slowly pulling at his tongue with his fingers, he tried to pat the spot that got scalded by the hot coffee.

"Eww, what are you doing?" a voice asked as he looked down and noticed a young boy looking at him, his face scrunched up in disgust. Hiro shot an eyebrow upward before he let his tongue go and pulled his tongue in.

"I buwned my tung," he said as he tried to pronounce the words without irritating his tongue. The boy just furrowed his eyebrows. "What do you want?" Hiro asked suddenly, finally managed to speak out properly without flinching at how numb his tongue was. The boy just blinked before shrugging and walking away to a table where his mother was.

Hiro followed the boy's gaze before he sighed and shook his head, bringing the cup again to his lips. This time, he slowly sipped the coffee and felt the warm rich flavours bathing inside of his mouth in pure bliss. He felt a bit awake already.

Just then, the café doors opened, signalling another customer. Hiro sighed and decided that this place was getting a bit too crowded for him. Maybe he would just finish his coffee upstairs. As he got up and ready to walk around the table to go to his room, he was pushed slightly almost sending him flying to the ground with the coffee sploshing in his cup.

"Hey!" Hiro said before he straightened himself.

"Oh, sorry," a voice apologised as Hiro turned around to face with the person who had pushed him. He looked at the person for a second before something in him clicked and he took a sharp step back. "I'm sorry, I didn't mean to bump into you."

What?

Hiro's mind whirled around slowly as everything around him screeched to a stop. His eyes widened a fraction bigger at every passing second as his breath left his lungs. The silence suddenly zoomed between them as he stared at the man in front of him.

What?

The words echoed in his mind as the emptiness flooded throughout his body. His muscles twitched and his feelings jumbled up. Nothing was making sense right now. It was a whole bloody mash of green, black, yellow, orange, red and white inside and it was swirling. It didn't make Hiro feel well.

What?

Dropping his cup of coffee with a loud crash on the ground, everything in the café went silent. Hiro just stared at him, his brown eyes searching into the other man's. Something wasn't right here. This was impossible. He wanted to wake up now. This wasn't funny anymore!

Cass immediately poked out from the kitchen. "Hiro? I heard something crashing," she said as she saw Hiro, looking transfixed staring at someone. Tears blurred slowly into his eyes and anger suddenly flashing into his mind.

What is this cruel joke? This isn't funny!

"Are you alright?" the man asked, somehow worry flashing onto that familiar face. Cass furrowed her eyebrows before she walked towards Hiro in worry.

"Hiro?" she asked as she patted on his shoulder, startling Hiro out from his transfixion.

"Why—How—What?" Hiro asked, his voice trembling in confusion and frustration. The man just blinked, somehow guilt flashing over his face.

"I seriously didn't mean for this to happen. I just bumped into him," he said as Cass sighed and looked up to the person.

"It's alright. Hiro's just—."

She stopped mid-sentence when she saw the man in front of them. It was the exact same look as Hiro was making. This was something that would cause anybody to stop and stare in horror and mortification. The man shuffled his weight from one foot to another, somehow feeling really awkward with the gazes. Scratching the back of his neck, he decided to just take a few steps back. "I'll just…leave."

"Wait!" Cass suddenly reacted as she grabbed onto his sleeve and tugged him. The man jerked in confusion and shock before looking at the woman. Blinking at her, Cass just stared at him. Her eyes were wide and pleading as her fingers dug into his sleeve cloth. "Please…wait."

The man soon found himself sitting in front of Hiro and Cass. He had a cup of coffee in his hands as he sipped it slowly, looking around at anything and everything inside the café except at the both of them. He was really starting to feel uncomfortable, Hiro noted. The shock was still there, but it somehow subsided after a while staring at him. Something in Hiro realised that this wasn't what he thought it was. After Cass had asked him to stay behind, the man sat on one of the chairs and waited until Cass closed down the café so they could be alone.

Now, he was here, in front of them, waiting for whatever this was. Cass sighed as she tried to hold back her emotions. Hiro was trying his best not to get up and punch him in the face, just for the mere satisfaction of seeing that familiar face bleed. Mochi meowed slowly as it purred next to the man, somehow finding that this man was comfortable. Hiro narrowed his eyes at that damned cat. It was never that nice with him unless it was Aunt Cass or…or Tadashi.

Swallowing the familiar lump, he looked back at the man. "Tadashi."

The man jerked away from his sight-seeing and looked back at Cass and Hiro. Placing down his cup, he blinked again in confusion. "Y-Yeah?"

Hiro's eyes widened at that before Cass sighed, trying to avoid her emotions from showing on her face. "Y-Your name is Tadashi?" she asked, failing to keep the slight tremors from her voice. The man, who was named Tadashi, nodded before straightening himself.

"Y-yeah, I'm Tadashi," he said, confirming it. "Tadashi…Takachiho."

Hiro felt the lump slowly dissolve as he stared at the man who looked exactly like his deceased brother. The same hair, the same eyes, the same nose. Everything about him looked exactly like his Tadashi. Except for his last name. He squeezed onto the cap in his hand, the cap that he had to take off from his head, feeling slightly cautious about using his brother's belonging all of a sudden.

"Oh," Cass said somehow accompanying it with a slight laugh that sounded a little too broken. Silence brewed in for a minute before she continued, "I thought—you just look so alike."

"Alike?" the man asked, raising an eyebrow the way Tadashi used to. Hiro felt the nostalgic moments getting to him before he looked away, eyes blurry again. His voice was the same, maybe a bit deeper from before. But Hiro couldn't be so sure. It had been two years since he had seen and heard him. He felt Cass holding onto his hand tight, gesturing him to hold it back.

"Yeah," Cass said before she smiled. "You just—you look like my nephew. His name is Tadashi too."

The man looked silently surprised before nodding awkwardly. "I see. Good looking as well then, I assume?" he said, joking slightly before Hiro snapped his eyes and looked at him. Somehow, he couldn't help but to feel angry at those words. He sounded so much like him. He acted so much like him and this made it worse.

How could he act that way?

As much as his rational mind was screaming at him that this man wasn't Tadashi, his irrational part of his mind was being too dominant at the moment.

"He's dead," Hiro hissed out as the man found his threatening smile dropping. Cass sighed before she looked at Hiro pointedly.

"I-I'm sorry," he said. "Maybe I should leave. I won't come back, I'm sorry," he said slowly only for Cass to shake her head.

"No, it's alright," she said slowly. "We just miss him. Today's his death anniversary."

Hiro looked down and sighed gently to himself. This day was so bizarre and strange for him. "I'm sorry," the man continued to apologise, somehow his eyes scanning over to Hiro, who was hunching in his seat defeated. "I'm sorry."

Hiro's eyes widened as he looked at Tadashi—that Tadashi in the eyes. Somehow, the apology stroke deep inside of him, as if the man was really apologising from deep inside of his heart. Hiro searched into his eyes, but all he got was the blank look. Nothing in those eyes showed any signs that he recognised Hiro or Cass. It was blank, like a white canvas.

"This is Hiro Hamada. Tadashi Hamada was his older brother. And I'm their aunt, Cass."

Hiro felt the tears brimming around his eyes before he got up slowly. "I—I have things to do. It's nice meeting you. Good night, Aunt Cass," he said quickly, avoiding Tadashi's eyes before he walked past them. He felt the man's lingering eyes on him but he ignored it assuming it was his own longing and climbed up the stairs before he entered his room. Walking to his bed, he slammed face first into his pillow.

It swept him from inside as he pushed his face into the pillow and tried to take deep gulps of air. This wasn't his brother. That man was just someone who looked and acted like him. He wasn't Tadashi Hamada.

He closed his eyes shut as he willed the tense emotions to go away. He could do this. Tadashi wasn't coming back, he reminded himself. He saw Tadashi going into the fire. He saw him dying—somehow. Even though they found nothing but ash, he was sure it was Tadashi's.

He was dead.

And this man, no matter how similar he looked or how close his name resembled, it wasn't Tadashi.

Hiro probably wouldn't even have to see him anymore. So, he tried to forget it. That night, he spent hogging onto his work, dragging Baymax into the garage to get him checked and upgraded. He asked Baymax to replay back the footage when Baymax was being created. Even though it was slightly distorted because of the damage the chip received during the retrieval, he could still make out Tadashi's grin and joy when he found out Baymax worked.

Hiro felt himself smiling as he watched the video a few more times, his fingers grazing slightly on Tadashi's face. The man, he looked exactly like him but he could never be this Tadashi.

Hiro was sure of that at least.

The night coloured deeper and somehow, Hiro found himself dozing off in the middle of his work. His eyes began to tire and before he knew it, he was sleeping again, head leaned against the desk, leaving Baymax to stare at him with a tilt of his head.

"Hiro? Should I stop the video?" Baymax asked but Hiro didn't respond, already lulling into a deep sleep listening to his brother's voice in repeat. Baymax assumed the high levels of calmness Hiro was experiencing was because of that and let the video on for the rest of the night, watching Hiro sleep since he was not told to be deactivated.