Hasuta and Mahiro meet and learns the person he's looking for is his mother. Yoriko is kidnapped by a mysterious woman for some unknown purpose. Kuuko is also blackmailed into helping her. Mahiro, Nyaruko and Hasuta set out to R'lyeh again to rescue them. During the events, Mahiro and Hasuta have a series of awkward moments. Traveling in an underwater submarine and avoiding obstacles they reached their destination.