Stereo-Cassette King (ステカセキング) is a chojin based on an stereo-cassette player. He's a member of the Seven Devil Chojin. He is a manipulative and irritable chojin, who is always annoyed for been considered as the weakest of the Devil Chojin, despite his abilities. Springman is the only one who has a close relation with him, united by the fact that both are treat as mere toys by their trainer, Sneagator.