One day, the mysterious Guri, an angel of love, unexpectedly appears before high school student Seiji Aino and insists that he kiss a girl. However, Seiji prefers Guri and ends up becoming connected to her. But how will his classmate Akane Hiyama, who also happens to be a typical yandere, react to this? Eventually, Seiji finds himself caught in a love triangle, torn between Guri and Akane, and receives the "Protection of an Angel."