Minazuki Hoshi, a former male caregiver at a nursery school, finds himself unexpectedly called upon by the Demon King. Faced with a threat, Hoshi reluctantly agrees to become the caretaker for a group of magical children and monsters. His new life is filled with unexpected twists and the awkward charms of adorable girls like Liberia from the realm of Satan, the Young Succubus, and Kufei of the Demon Wolf tribe.