As Igawa Asagi tries to enjoy a rare moment of peace after years of service as a shinobi, disturbing signs point to the return of her long-vanquished rival. Through a dark pact with the city's head demon, the archenemy plots to dismantle everything Asagi holds dear, beginning with calculated strikes against her loved ones. Her devoted boyfriend and her younger sister, herself a capable shinobi, soon find their lives upended by schemes designed to inflict deep emotional wounds. Asagi must quickly rally her skills and instincts to shield her circle from the escalating threat before it shatters their fragile stability.