Koyoi Takase is a member of the male idol unit WITH, performing alongside Asahi Mitaka and Shōgo Yumekawa. The unit hails from the Idol Time PriPara universe. During time-space travels, WITH becomes entangled in a larger story as dimensional disruptions cause their world to collide with that of the Prism Star unit SePTENTRION. This meeting unfolds as part of the Prism Tours adventure, which connects the PriPara, Pretty Rhythm, and King of Prism universes. Koyoi Takase appears with SePTENTRION in the film's official key visual.