There is a group of beautiful girls who fight against the "gods of calamity" who bring misfortune to people. They are called "flower shrine maidens" and live together in the "Night District Castle". Arata, a mere part-time high school teacher, decides to become the chief of the flower shrine maidens after the death of his father. However, organizing a group of flower shrine maidens full of unique and problematic characters is more difficult than he imagined...