Shōgo Yumekawa, originating from *Idol Time PriPara*, is the older brother of protagonist Yui Yumekawa. He initially expresses strong skepticism toward female idols, actively discouraging his sister's aspirations and dismissing the value of such dreams. This opposition creates significant sibling conflict, with Yui resenting his interference and vowing to prove him wrong.

He later becomes a member of the male idol unit **WITH** alongside Asahi Mitaka and Koyoi Takase. In *King of Prism -Your Endless Call- Miinna Kirameki! Prism☆Tours*, **WITH** enters the broader narrative when dimensional disruptions collide their world with that of the main Prism Star unit **SePTENTRION** during their time-space travels. His participation in the Prism Tours adventure bridges the *PriPara* and *Pretty Rhythm*/*King of Prism* universes, highlighted by his appearance alongside **SePTENTRION** in the film's official key visual.