"Chiaki" and "Tsugumi" live in the same apartment as Shota. Shota, an erotic boy who likes big breasts, takes advantage of his parents who sympathize with him because his parents tend to be away and is a key-locker, and continues to play erotic pranks. Shota, who is attached to a natural mother and daughter, finally succeeds in a man's dream, a plump busty mother and daughter's oyakodon!
