Twelve‑year‑old Koushi Nagumo"s world turns bleak when his father leaves after their home is destroyed by fire. Alone and desperate, Koushi falls onto the sidewalk until a quirky woman named Mineru Wachi notices him and takes him to the girls" residence "Megami‑ryou." Upon discovering Koushi"s plight, Mineru—acting as interim director—asks him to serve as the official housemother of Megami‑ryou. Yet he finds himself among a cast of eccentric inhabitants, including the shy yet kind Atena Saotome, the girl‑like tomboy Kiriya Senshou, and Mineru herself, whose scientific experiments are wildly reckless. Still, Koushi strives to meet the responsibilities of this chaotic new existence!