The manga centers on a second-year high school student who is standing in for his Catholic priest father to protect their church while his father is away. He saves a troubled beautiful young girl who is in front of his church one day, but she turns out to be the demon Asmodeus.

Anzu goes to a preschool with her friends, the shy Koume and the eccentric Hiiragi. Together, they try to gain Anzu attention from their male caretaker Tsuchida, though he is clearly more interested in the pretty Yamamoto who supervises the class next door.

Shiho, Cocoa and Himeka are three sisters who live together with their protective older brother. As their parents are off traveling the world, the brother has taken on the parental role as well as taking point in the bakery that all the siblings operate. As a result, the brother has developed a sister complex, becoming, at times, overbearing to Shiho, Cocoa and Himeka. This is a comedic story about their little weird family.