Sion Tōdō, an idol from PriPara, participates in the Prism Tour event alongside fellow idols Laala, Mirei, Sophy, Dorothy, and Reona. During the tour, Meganee and Meganii organize a contest pitting her unit, Dressing Pafé, against SoLaMi♡SMILE; Dressing Pafé performs "CHANGE! MY WORLD" for the competition. An unexpected system error triggered by Falulu's performance diverts the Prism Tour train to the Mascot Graveyard. There, the group meets Cosmo Hojo, who provides Prism Stones enabling entry into the Prism Show world. Saints Aira, Mia, and Naru guide them through different tour routes featuring various Prism Show performances. When the Prism Show World begins to collapse, Rinne instructs Sion and the others to use their Prism Stones. During the group's collaborative performance of "Realize!" to restore the Prism World's sparkle, Sion specifically utilizes a Prism Jump. Following the successful restoration and return from the tour, Sion is part of the group encountering Cosmo again, learning the tour inspired the creation of Cyalume coordinates. The film concludes with Sion and the others realizing they remain stranded in the Mascot Graveyard alongside Kuma and Usagi. Within the film, Sion demonstrates perceptiveness and strategic thinking, often viewing situations through the lens of Go strategy. Her competitive nature surfaces during the contest. While generally projecting calmness, she possesses an underlying headstrong and stubborn determination. She consistently maintains her unit partnership with Dorothy and Reona, working alongside them during performances and the effort to restore the Prism World. Her character design features dark purple hair styled in a thick, slightly messy side ponytail with longer spiked bangs on one side, golden amber eyes, her signature bat wing hairpiece, and her preferred Baby Monster brand. *citations*