A/N: Hello Everyone! So I saw Big Hero 6 and like everyone else I laughed and cried and simply fell in love with the movie and then I got hooked to the song My Songs Know What You Did In The Dark (Light 'em Up) By Fall Out Boy and while listening to said song I got hit with the inspiration to start writing this series with my OC Sakura. The chapters are going to alternate between the past and the present. The past will provide a few glimpses on my character's life as well as the relationship with all the characters from Big Hero 6. Another thing, this is an AU and Tadashi doesn't die in this. And be warned that this is a Tadashi/OC fic. So I hope you enjoy and please do leave a review. And if I make a few mistakes than please forgive me. I've only seen the movie once but I do hope that I get the facts straight.

Disclaimer: I wouldn't be writing this fan fiction if I owned Disney now would I?


"So was that everyone on your little Nerd Team?"

Hiro asked cheekily as he stood beside his brother, helmet in hand. They had just stepped out of the Institute, after meeting everyone, and were about to head home. His older brother grinned and nodded, putting his own helmet on.

"Yup!"He started the mopped as he counted his friends on his fingers one by one.

"Gogo. Fred. Honey. Wasabi. And..." His eyes widened with disbelief with a hint of fear, as he paled and breathed out.

"Oh crap!"

Hiro's smile widened all the more when his brother was almost immediately cut off by a loud shout from the top of the stairs.

"Tadashi Hamada!"

Both brothers turned to look at the stairs where a figure was walking towards them, their steps quick and determined. Tadashi seemed to shrink where he sat on his mopped, while his younger brother, with his helmet still on, waved excitedly.

"Hiya Sakura!"

Immediately a bright smile was directed towards him.

"Hello Hiro!"

The younger boy was then swept into a giant bear hug by the girl. She lifted him off his feet, the both of them laughing before she deposited him back on the ground looking at him, her eyes shining.

"Oh its so good to see you! Its been almost three days since I last saw you. I was worried when I got Tadashi's text about the Bot Fight. Why did you even go there anyway? No wait! What were you thinking?! For being a smart kid that was pretty dangerous and stupid Hiro."

As she spoke she started to turn his head around, eyeing him from head to toe.

"You're not hurt are you? If it were up to me I would glue that helmet to your head."

She laughed rapping her knuckles smartly against the object. Worry and concern was written all over the older girl's face as she inspected him for any kind of bruises or even a scratch.

"Seriously are you ok though?"

Her voice was soft, violet eyes laced with concern as she looked at Hiro in the eye.

"I'm ok, Sakura!"

Hiro said pushing her hands away gently, with a grin. He knew how the older girl could get with him. She was always checking up on him and making sure he was eating properly and sleeping well. Whenever he was about to try out one of his new inventions she would make sure to be just around the table, that was put up to protect them if need be, with a first aid kit and a fire extinguisher. He didn't mind though. He loved the attention and Sakura loved to take care of him. Smiling lightly Sakura stood up straight, ruffling his hair, making it messier than ever.

"I know you're ok, Squirt!"

Hiro protested laughingly batting away her hands.

"H-hey Sa-kura."

A small voice called out. The girl turned, her long pony tail swishing around her head with the movement, to look at the older Hamada brother, her face completely devoid of any emotion. Beside her the younger Hamada brother grinned slyly as he stood behind the black haired girl, partly hidden. His eyes relayed a single message to the victim.

"You are so dead, bro!"

A/N: And that my dears was the prologue. Hopefully I'll upload the next chapter asap. Btw does anyone know how old were Hiro and Tadashi when their parents died? Just leave the answer in the review. I hope you enjoyed this chapter. :) See you, Turtleducks.