One push is all it takes -BNHA story

Living on your own is a hard life, luckily for Kai she was picked up by a rather peculiar choice of person. Aizawa shouta saw potential and power in this young child and took her in before any evil force saw the potential too. Leaving her friend behind in the streets, Kai began her new life as a hero in training.

What if her long lost friend comes back?
And what will she do if she finds out he's a villain?