Tadashi made a promise to Hiro the moment he saw his brother.

A promise Tadashi always keep.

Keeping the smaller Hamada out of trouble was his top priority, even as little kids on the playground.

As Hiro grew Tadashi protected him, stood up for him when the older kids bullied the kid genius.

However every time Hiro came home bruised he realized it was a promise he couldn't keep.

At some point in Hiro's life, he would be gone.

It was a promise meant be keep.

It was a promise broken the moment he ran.

"I will never leave you,"