Note: Hello again! I'm back writing another major bh6 fic, this time a sequel after the movie. I'll probably be writing and updating two-three chapters a month in case I don't get burned out. This story will have many ocs but I promise not to use so many.

Disclaimer: Big Hero 6 and its characters belong to Disney. Any non-canon characters, however, are mine.

Prologue

The karate dojo was quiet that afternoon, missing the sounds of students sparring one another and their sensei loudly instructing the proper ways to land a blow.

It would have been nearly empty if it weren't for two brothers who were using it to practice martial arts on each other.

Twelve-year-old Hiro, a young genius who has one more year to finish high school, is staring intensely at his older brother Tadashi. The two faced each other and bowed. Their fight now begins.

Slowly breathing through his nose, Hiro concentrated harder while he danced in a circle. Tadashi did the same, going into defense mode.

Hiro made his first move; he shot his hand forward but Tadashi blocked it.

"Too slow," he told his younger brother.

Hiro immediately drew back and tried again. He let his fists and kicks fly recklessly while Tadashi casually block and dodge them. He didn't even break a sweat and he was grinning much to Hiro's mild irritation. Hiro tried to move as fast to counter Tadashi's moves and he made no further progress attempting to strike him down.

He decided it's time use his ultimate move which he had been practicing in secret. With a battle cry, Hiro spins into the air and performs a downward kick. Tadashi quickly backed away before he gets hit and Hiro landed on the spot where Tadashi once stood. Silently cursing his badly, Hiro swung a knife hand but his brother avoided it and sent a hook kick, knocking the younger boy to the floor.

Hiro is beaten. No matter how many times the brothers fought, Tadashi always proves that he's still the boss.

"I win again," Tadashi smirked. "This is my… I lost count… thirty-seventh winning?"

"Shut up," Hiro groaned as he sat on the floor. His flying kick move put too much strain on his leg and he is now rubbing the sore pain.

Tadashi kneeled down, his eyebrows scrunched in concern. "You okay?"

"Yeah," Hiro said, nodding. "It doesn't hurt that bad."

"What was THAT move you tried to hit me with earlier?" Tadashi asked. He scratched his head, now amused. "It doesn't seem very practical for self-defense."

"Who says it's for self-defense? I did it because it's cool," Hiro said.

"You watch too many movies."

Tadashi helped his brother up and then offered him a water bottle from his messenger bag that was sitting nearby. Hiro gulped half of it down his dry throat.

"Your strikes and defense need more polishing," Tadashi said. "And don't dance around so much, you're still lacking discipline."

"Gimme another round," Hiro demanded. His face is shining with sweat and he's breathing heavily.

"Maybe some other time, little bro."

Tadashi looked over the clock and saw it was getting late. He needed to get home and get to work on his homework. He's interested studying at San Fransokyo Institute of Technology, or SFIT, after he graduates high school, and he needed to get high grades to get into the prestigious university. He wanted to pursue a major in robotics which had been his dream ever since he was a young boy.

Both he and Hiro are brilliant inventors who loved to build things, though both of them have different views on using their gifts. Still, the two brothers enjoyed inventing together; after their parents died when they were both very small, the two became close friends and consider each other the only ones left of their family. Sure they have their Aunt Cass to take care of them, but Hiro and Tadashi's bond is what prevents them from feeling sad and lonely.

Hiro pursed his lips. He's resentful that his brother wants to leave, especially distancing himself so he can be more absorbed in his studies.

"Just one more round," he begged again.

"No, Hiro," Tadashi shook his head. "We need to get home. You got a lot of homework to catch up as well." He started to head towards the bathroom when he heard Hiro beginning to whine.

"Nii-san."

Tadashi stopped in his tracks and he turned to look at his brother. His lips formed into a small smile.

"Aww… I haven't heard you call me that since we were kids," he said.

Tadashi remembered fondly how he tried to teach Hiro speak Japanese like what his dad did to him so he can talk to his grandparents. Hiro could only get a few basic words before giving up. However, he got attached to the word "nii-san" which he used to address Tadashi when he was little in case he needs something from him but Hiro also stopped saying it… until now.

"Alright, one more round," he sighed, shaking his head.

He and Hiro bowed again and they moved to their stances. Before Hiro can attack, Tadashi dashed forward and made a low sweep towards Hiro's leg. Hiro thought Tadashi was going to trip him, but he pulled a fast one—it was actually a feint. In one fast moment, Tadashi used his same foot to trick Hiro that was going to sweep his legs only to switch it into a roundhouse kick to Hiro's head.

Hiro fell flat on the floor, is face burning with humiliating defeat.

"Duuuude! That was a dirty trick!" Hiro moaned.

"It's all a matter of fooling the enemy and letting their guard down," Tadashi cheekily told Hiro. "And that's a combo trick you should try practicing."

"I'll kick your butt!" Hiro proclaimed in childish anger.

"Eh, you're a hundred years too early to defeat me," Tadashi snorted.

Hiro stuck his tongue out his big brother. Next time, he won't lose to him again...

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