Aoi Kururi is an onmyou-ji studying odors at a private academy. He actually dislikes using onmyou magic, but when a spell is mysteriously cast on his entire class that causes everyone to wet themselves, he discovers that his magic grows stronger with the warm power and sweet scent of girls' urine, allowing him to save his class by breaking the spell. This is the story of the strange misadventures of Aoi, his sisters, and his friends.