Your an angel. the last one of all your kind. you lost them all during the war of Angels and Devils where the Demons won and took down all of them.

but you manage to survive. they're actively looking for the last one. They know you're alive

they send a demon named Hoshi to come and hunt you down.

during all this chaos, you are hiding in the bushes in the forest clutching your arm from a previous hit by a bullet when you hear footsteps behind you