The Toilet.

Before you start reading..
TW: GORE. (NOT MUCH AND NOT DRAMATICALLY WRITTEN)

TW:SUICIDE. (MAY BE HARD FOR PEOPLE TO READ THROUGH IT)

I DONT KNOW WHAT ELSE COULD BE TRIGGERING ACTUALLY.
it's also confusing as hell.
So heres the real description:

There are two boys. They dont really like school, well... who does like school? And they always skip class in the toilets. However, one day they end up doing something that changes the way of the city, maybe even the world.

(I don't know what the creatures look like, nor how the characters look like, let your imagination run free on them)