Shin Megami Tensei if...

Shin Megami Tensei if... is a side story to the Shin Megami Tensei series, rather than a direct sequel. The setting is Karukozaka High School, which has been mysteriously sucked into a void and emerges in the realm of Makai, a world of demons. After arming him/herself with protective equipment from a sports locker, the player character must investigate the various worlds of Makai, which are based on five of the seven deadly sins.