Okay... so while I know I already have a lot of stories going on... I just couldn't help myself. I was re-read my Big Hero 6 manga and this idea just came to me.

So before you go on. This story will be following the Big Hero 6 manga adaption...which means the death of Tadashi is different.

If you haven't read the manga I would say go read it. I love it! But most of this chapter covers the part of the manga I got the idea from. So yeah, let's get to it!

Ch.1

It was late at night when Tadashi had gotten the call. He hadn't expected a call this late, but it started off simple enough. "No, that's okay…"

But then what he heard next concerned him. "No! You can't do that!" He knew it was late, but he couldn't help from raising his voice. He just hoped that he hadn't woken up Hiro. "One wrong move, and the whole city could…" He trailed off as the voice on the other half started to talk again.

It soon got to the point where he thought it was going to go. "I'll be there as soon as I can…"

Tadashi quickly changed out of his pajamas and changed back into his clothes. He grabbed his bag and hat before heading out of the room. Before he did though he peered once over at Hiro, who was still fast asleep in his bed.

Tadashi let out a sigh. He hoped by the morning he could talk things out with Hiro. He hated to see his little brother so upset. But now was not the time to stand around thinking about that. Tadashi slipped out the door and downstairs.

He snuck outside and grabbed his bike and headed off towards the university. He pedals as fast as he could. He couldn't waste anytime.

As soon as he got to the area of the university he needed to be at he parked his bike a good bit away. He did that just in case. He then headed over to the wall...where the secret door was. He punched in the keycode and headed inside and down the hallway.

He just hoped he wasn't too late.

Little did Tadashi know… but Hiro wasn't actually sleeping. He was awake and had seen him leave. Not only that… but Hiro was following him quietly.

Hiro had watched Tadashi put in the keycode that opened the secret door. Once he had waited a few minutes he walked over there and put in the code that he had seen Tadashi enter.

Hiro looked down the long hallway that lead down somewhere. He stared for a moment as he continued to wonder what was going on. "I don't know what's going on…" Hiro then started to run down the hallway. "But now that I'm here… I want to find out!"

Suddenly Hiro was stopped dead in his tracks as he heard a voice cry out from farther down the hall.

"No!"

Hiro gasped. It was Tadashi's voice! He continued to run until he made it out of the hallway and entered into a large room. Hiro wandered in as he wondered what the place was. He guessed it must be some kind of research facility.

But the biggest thing that caught Hiro's attention was the large circular machine that seemed to be generating a large amount of power. There was a glow power in the center of the machine and it was swirling around.

"What in the world is that thing?!" Hiro wondered to himself.

He stepped a bit closer as he inspected the strange machine. He could feel the energy being generated from it. There was a slight pulling force coming from it. The more he looked at it the more he started to figure out what it could be.

"That's a lot of energy," he muttered aloud. "It looks like another dimension."

"Argh!" someone suddenly cries in frustration.

Hiro's attention was directed to the main floor below him. There was someone at a computer terminal typing in various things. Whomever it was wore a black trench coat, but Hiro couldn't see his face properly.

"Still not enough power?" the man grumbled.

From the sound of the man's voice Hiro could tell it was not Tadashi… but then who was it? The man suddenly looked up and saw Hiro. That was when Hiro saw that the man was wearing a kabuki mask.

"Who's there?! What are you doing here?" the man shouted.

Hiro backed away slightly. "Oh no… he found me!"

Hiro was ready to turn and run… but he started to feel himself being pulled backwards. The force of the portal was growing stronger and stronger and now it was pulling him back into it! Unable to move away he was pulled over the railing and back towards the portal.

Hiro cried out in shock and fear as he tried to reach out for the railing. "It's pulling me in! No! It's gonna swallow me up!... I'm scared!" So many thoughts coursed through Hiro's mind in a matter of seconds.

But also within those seconds Tadashi had run down the ramp and grabbed hold of Hiro. He glared ferociously as he shouted, "Hiro!"

Hiro couldn't tell if he was angry at him for following… or if he was scared that he may not have made it in time.

"S-sorry.. I… was just curious…. I followed you here and I…" Hiro started as Tadashi yanked him back into the ramp.

"Hiro! Get out of here n-" Tadashi started to say, but he abruptly stopped as he shoved Hiro aside.

Hiro then saw why. A large pipe had been pulled from the wall and was being pulled into the portal. And it just collided right with Tadashi! Tadashi was about to go over the edge and was going to be sucked into the portal!

"Tadashi!" Hiro cried out as he grabbed onto his older brother's wrist. His heart began to race as his breath began shaky. He had to pull Tadashi back. He just had to Though he knew he was younger and Tadashi was far heavier than him. But he couldn't give up!

"Hiro!" Tadashi shouted as he saw that Hiro was struggling.

"H-Help! Somebody help please!" Hiro shouted instinctively. He then looked and saw the man again, who just seemed to be watching. "Help!" he shouted, hoping that the masked man could hear him.

But much to his surprise the man turned and left. Hiro gasped. "That…. Guy…"

The strength of the railing was starting to give… and it was bending towards the portal. Hiro kept holding on though. He wasn't going to let go of his big brother. He just couldn't do that.

"Hiro…" Tadashi said again. But he looked at Hiro closely. He could see that Hiro was struggling. There was no way Hiro had the strength to pull him back over the railing.

"I… I'm gonna… save you Tadashi… I'll save you… no matter what!" Hiro shouted… but he was still struggling.

Tadashi sighed internally. He knew Hiro wanted to try… but he knew it wasn't going to work out. He knew though he had to tell Hiro something though. The important things.

"Hiro…" Tadashi started. "Listen to me. I don't want you to hold this against him."

Hiro looked at Tadashi with surprise. "What? What are you…?"

Tadashi didn't wait for Hiro to finish. There wasn't enough time for that. "Sorry… about today. After all the time we spent together… I never really understood what you wanted."

"But… you're still leaving right? For that other school?" Hiro asked, the sadness and loneliness coming over his expression.

Before Tadashi could answer him Hiro went on to talk more. "I always wanted to be an inventor… to be like you Tadashi. That's what I've been working for… but…" Hiro paused for a moment. "Tadashi… did you get sick of me?"

The words stung Tadashi's heart. He hated that he ever made Hiro think something like that. "No… Of course not. The world is just full of different people and different environments… I just wanted you to see them… to learn about them. I wanted your world to be bigger than me."

Tadashi could see the tears swelling up in Hiro's eyes. He also wanted to cry, but he had to stay strong. He needed Hiro to see him being strong.

"Man… I wish I could have seen it… The world you're going to create."

The words pained his heart dearly and he could tell it was having the same effect on Hiro.

"What?" Hiro asked weakly. He shook his head as tears flew from his eyes. "Why… Why are you talking like that? I told you… I'm going to save you!"

Hiro held both of his hands around Tadashi's one...but his grip was slowly slipping. Tadashi's heart sunk. He loved his little brother so much. He knew this wasn't the way he wanted it… but he knew it was going to be best in the long run. Though… that still didn't make the pain in his heart feel any better.

With all his might, he forced a smile. He wanted his brother to remember him that way. "Yeah… Thanks… Hiro." With his other hand he pulled away Hiro's hands… releasing him from Hiro's grip. "I'm...so proud… of you."

It was hard for Tadashi to keep hold of his smile. He closed his eyes as he tried his best to hold it, though his true emotions were coming through as he felt a tear stream down his face. He heard Hiro scream... but he didn't want to look. He knew he wouldn't be able to bare seeing Hiro so distraught. He could feel himself being pulled right into the portal.

Just as he felt like he was being pulled in… he heard one final cry from his brother.

"TADASHI!"

Tadashi had fallen into the portal and immediately felt like his entire body was on fire. The pain was unbearable as every part of his body hurt. Nothing felt right at all. Everything around him seemed to blur and swirl and he couldn't make out the area around him.

He closed his eyes as the pain increased.

And then there was no pain at all.

Dazed and confused Tadashi opened his eyes and let them adjust to his surroundings. It took him a moment but he realized that he was back in the research facility.

"How…? I thought I was sucked into the portal… How am I back here?" Tadashi thought to himself before looking around. The portal looked slightly damaged was no longer working and there was debris everywhere.

Tadashi started to stand up and was about to inspect the room… when he noticed something felt off about himself. Something felt strange about his body. It felt light… almost like it was nothing at all.

He looked down at himself gasped. He was transparent! With a shaky hand, he held it up and looked at it. He could see right through his own hand.

"Am… I dead? Am I a ghost or spirit somehow?" Tadashi wondered to himself. "Does this have to do with the portal?"

So many questions came to his head as he tried to figure out what had happened. He looked down at the ground and sighed as he couldn't seem to think of a answer for himself. He then noticed his hat under a piece of rubble.

He crouched down and slowly reached his hand out towards it. As he feared his hand went right through it. He quickly stood up and stepped back. He started to pace back and forth as he tried to think of what could have happened to him.

He thought back to the portal and being pulled into it and the pain his body went through once he entered. Maybe there was a connection there.

"Maybe… Hmm… Did the portal maybe destroy my body since I didn't have any proper protection? I don't understand this…"

As he stood there in his thoughts he remembered something else. Someone important. "Hiro!" He ended up shouting aloud, but there was no one there, so he had no idea if he could even be heard by others. He didn't see Hiro anywhere nearby or anyone else for that matter.

"How long… has it been since I was pulled into the portal?" Tadashi asked himself though eh knew of course he didn't have the answer.

He knew though that he needed to find out first if anyone could see or hear him. He made his towards one of the exit doors. He reached for the doorknob out of habit, but his hand just went right through. He sighed to himself. He wasn't sure if he could ever get use to that. With a deep breath he stepped forward and walked right through the door.

He made his way outside of the university. It was nighttime but he had no idea if it was even the same day anymore. He started to walk in the direction of home, looking all around him. There wasn't anyone really at the campus at night… so that didn't help him at all.

But once he reached town… that was different. It was still fairly quiet out, but there were still some people up at the late hour. Tadashi walked right by them and they didn't even notice him.

"Hey! Can you hear me!" Tadashi shouted at the next person to walk past him. The person didn't even turn their head or anything.

Tadashi sighed heavily. What he feared was true. No one could see or hear him. He really was a ghost… He really was dead then.

He stood on the sidewalk as he stared down at the ground. It was all a bit much to take in. But he figured out what must have happened to him.

He had died.

He was dead.

But now he was just a spirit that could wander round.

A spirit that no one could see or hear.

He never expected anything like this to happen.

After standing there for a while he finally came to a conclusion. Though he was a bit wary due to his circumstance… he decided that he would make his way home. He knew that no one could see him… but he needed to make sure that Hiro was all right. Even if Hiro wouldn't be able to see or hear him… he wanted to see his little brother again.

So everything of course until Tadashi falling into portal and waking up was all around from the manga.

I really liked the angsty way Tadashi died in the manga. It just gives more feels for poor Hiro there. But anyways... I wanted to play around with this idea since i started it up. Tadashi as a kind of lingering spirit thing.

There will be angst I tell you! Just you wait! I hope you all enjoyed this random idea I thought of. Let me know what you thought!