A string of mysterious disappearances is shaking society. “All the missing people apparently got isekai’d!” —or so the rumors claim. Yoshimichi, the protagonist, dismisses it all as nonsense… until one day, even his childhood friend Yuma suddenly vanishes. Their classmate Otogi, however, is convinced it must be another case of isekai reincarnation. Fired up with excitement, she declares she wants to go to another world too! While Yoshimichi reels from Yuma’s disappearance, Otogi drags him into a suspicious-looking building, and then—!?