In a dark and stagnant world, a girl awakens from a long sleep as the reincarnated Mitsuba, a daughter of a noble family. Her new life is shattered when her stepmother, scheming to secure the family inheritance, murders Mitsubas father and has the girl imprisoned in a dungeon. During her decade of captivity, magical spells were continuously cast upon her to keep her alive, but this exposure inadvertently awakens a forbidden power within her: a curse that should not exist in this world.

Mitsuba remains unaware of the true nature of her ability, yet the curse manifests instinctively to protect her. Anyone who harbors malicious intent toward her is systematically cursed and killed without her conscious effort. Her stepmother, hoping to be rid of her, arranges for Mitsuba to be sent away to a military academy. Far from being a place of discipline and order, the academy is filled with ambitious rogues, revolutionaries, and military reformers who secretly plot to upend the existing power structures.

For Mitsuba, who has known only isolation and betrayal, this den of schemers offers precisely the kind of engaging and unpredictable life she has always desired. As she navigates the dangerous halls of the academy, her curse continues to spread and eliminate threats, turning her into an unwitting agent of devastation. The narrative follows her journey through this otherworldly gothic dark fantasy, where the small girl carrying an immense and uncontrollable curse reshapes the world around her simply by existing.