Mayu Yoshida holds the role of class representative, her petite stature contrasting with the weight of her responsibilities. Plagued by persistent self-doubt, she navigates school life with quiet unease, particularly in social situations. During a vulnerable moment, she confesses to a peer her simmering resentment toward relentless classmates whose teasing erodes her confidence. Unbeknownst to her, this raw admission of anguish resonates with latent forces, unleashing a chain reaction where her emotional turmoil triggers a destructive metamorphosis in another individual. The resulting chaos obliterates the school, though Mayu’s memory of the event—and her unintentional catalyst within it—fades entirely, leaving no trace of culpability or awareness.