In the verdant city of Kazamatsuri, where nature and civilization interlace, high school student Kotarou Tennouji hides a secret: he possesses the ability to permanently rewrite his own physiology, granting him superhuman strength and speed at will. Drawn to the supernatural, Kotarou joins the school’s Occult Club, where he investigates mysterious phenomena alongside five girls—each with her own hidden abilities and connections to a deeper conflict. Together with his childhood friend Kotori Kanbe and the boisterous Haruhiko Yoshino, Kotarou’s ordinary life soon unravels. The seemingly peaceful city is a battleground between two secret organizations: Gaia, which summons familiars to restore the planet’s natural order, and Guardian, a group of superhuman warriors who seek to protect humanity. As Kotarou delves into the club’s investigations, he becomes entangled in a centuries-old struggle over the world’s future. The story follows the Terra narrative arc, the true route of the original visual novel, where Kotarou must confront his own origins, the nature of his rewriting ability, and the elusive girl Kagari, who holds the key to the planet’s salvation. Through battles, betrayals, and revelations, Kotarou must choose whether to side with Gaia, Guardian, or forge a path that rewrites fate itself.