In the city of Mato, from a diabolical dimension, lies a unique fruit that confers superpowers on the women who consume it. These women are part of the demon-fighting squads. Confronted by a group of monsters in this dimension, young Yûki Wakura is saved in extremis by a woman with the ability to transform him into an extremely powerful entity. However, the use of this power is subject to one condition: he must submit to her as her slave...