The characters and situations have been adapted from the OVA series. Cat-girl-robot Nuku-Nuku is now a student in a high-school class that has been stocked with characters: a mad scientist, a class clown, a singer, a psychic, a domineering class president, a singer, and so forth. Nuku-Nuku is still an (adoptive) member of the Natsume family, with genius scientist father Kyusaku, corporate executive mother Akiko, and son Ryunosuke. Kysusaku now has a very silly costumed identity as super-scientist Mister Q, and Akiko and other executives at her corporation, Mishima Heavy Industries, comprise a silly evil organization, Mishima Black; Akiko's costumed identity is Bloody Akiko. Ryunosuke recognizes all this is silly, and he frequently says so.