Kakeru, "Category 0," has saved Earth, changing events so many years ago that he was afraid he would lack the power to survive.
Good News: He's alive, and he still possesses his power.
Bad News: He's in the middle of a battle, his power is dampened, and he's stuck in a world of colorful ponies.
And if this world is anything like his own, his presence and actions may have skewed Equestria's timeline, and not for the better.
One thing's for sure: his power is going to come in handy. Whether it will destabilize time itself...

Psycho Busters crossover. Link to manga here.

Tags will be added as the story progresses. Some characters will not show up until later. Only some events will parallel the MLP series, since this story focuses on the adventures of Kakeru in Equestria and the changes he has brought forth.