On an artificial island, there's a mysterious case of the disappearance of people and the police didn't know what the cause of it is until they find a mysterious item that appeared in all of the belongings of the people that disappeared A card that has the name of Yamiyo, What Happened? To the people that disappeared?

Suzuya is just a normal high school student living a lazy life until he finds an orb little did he know that a simple orb is going to change his life and the people around him