You're Filled With Pusillanimity

Long ago, two races ruled over Earth: Humans and Monsters...
One day, war broke out between the two races.
After a long battle, the humans were victorious.
They sealed the monsters underground with a magic spell.
Many years later, a Human fell into the Underground.
He didn't want any of this to happen, but it might just save his life.

(Undertale x Male!Depressed!Reader)

(TW: Self-harm, Attempted Suicide)