After surviving the previous sexual misadventures, life begins to settle down for both Naoto and Rika. However, they aren't given much time for some procreative unwinding as a new menace enters the scene. Rika is called into action once again as Devil Angel Jiburiru but is caught in a tentacular trap and taken prisoner. Desperate measures are taken, and Naoto gives his sister some brotherly love in order to bring forth the power of a new devil angel.
