Learning that a mafia boss named Don Octo possesses a Rainbownian ring, Yuni once again takes on the guise of Blue Cat to try and steal it, much to others' chagrin. Sneaking into Don Octo's hideout and retrieving the ring, Yuni finds herself up against a newly appointed space police officer named Ann, only for both of them to be caught by Don Octo. Just as the girls rescue them the duo, Tenjou appears and turns Don Octo into a Notray. With the support of both Ann and the Cures, Yuni manages to defeat the Notray and uses her honesty to convince Don Octo to give her the ring.
