MARs and Serenon are filming a Prism Survival Challenge in Saipan, where they are tasked to find the legendary heart dolphin. Rizumu and Mion rescue a lone dolphin, which Rizumu names Kuchibashi and becomes determined to find its parents. After Serenon's Prism Show, MARs performs next, and Kuchibashi joins Rizumu's dancing, inspiring a new Prism Jump called "Dolphin Venus." The Prism Jump allows Kuchibashi to be reunited with a herd of heart dolphins.