Standing Tall Under the Doomsday

The cousin who comes to visit claims to be a reborn person, the sister of a friend has awakened superpowers and wants to fight against the demons, the boy I met by chance on the court is actually the savior, the girl who made a deal with the demons, the undead sleeping under the mass grave, the ordinary uncle who turns into a true god when he dies, the mysterious fog and fleet that invades the coastline... Is this the beginning of a bleak life? Hey, I almost forgot that I am still a person who has traveled back in time.