The protagonist is Minase, a young high school student who, driven by curiosity, explores the abandoned wing of the high school he attends. After stealing the key to the now dilapidated underground rooms, probably warehouses, he explores them and comes across a room that is different from the others: the walls are in fact covered in dark spots and strange symbols (all belonging to the symbols of black magic, such as pentacles drawn with the top point of the star pointing down). In the room there