blitzthecute
Once upon a time many centuries ago, the world was ruled by two species: Humans and Monsters. Both of these creatures thrived together using their special talents to help one another. That was until the humans declared war on the monsters out of the blue. They said "It was to protect our souls!" But in all honesty, it was for greed. This greed led to the monsters to be banished beneath a mountain, their only key to freedom for them to discard their very nature.
But rest well when I say the humans suffered their karma. Without monsters they soon lost their magic, along with their way of life. All who supported the war were punished and shamed, while the rest of humanity worked to rebuild their lives. They developed their own powers called quirks, with this power came the raise of heroes and villains. Quirks were quick to spread until only 20% lacked them.
It wasn't long before magic and monsters were reduced to legend with only a select few believing in them. This led many to climb the mountain to see if the legends were true, only to never return. This was because of the heartbroken monster king who put a bounty on every human who fell.
When the last human fell, the monsters were ecstatic. Finally they'll be free to wander the surface and feel the sun and the rain again! But unbeknownst to them, they have become even more trapped than they had before. With each reset the monsters were forced to live the same day over and over without anyone knowing ...Well, almost everyone.