A boy keeps a promise to a dead girl by becoming a monk, knowing it's the only way to stay beside her as she fights to stay human. The Shichisei aren't just enemies, they're a mirror of what Makina could become if she stops caring whether she lives or dies. Grief doesn't end here; it transforms into something harder to name.
Six months after a priest's murder, Ouri commits himself to becoming a monk. His reason is singular: to maintain his contract with Makina, a corpse princess bound to fight the undead. The Shichisei, seven elite shikabane responsible for killing his mentor, still hunt them both. But the real threat runs deeper. A traitor within the monk ranks has turned against the Kougon Sect itself, making a pact with the very demons Makina needs to destroy. What begins as a mission of revenge transforms into something far more complicated. Ouri must balance monastic training with battle preparation while Makina grapples with her own nature. The lines between duty, love, and survival blur as the Shichisei close in and the Kougon Sect fractures from within. Each fight brings them closer to answers about Makina's past and the reasons behind the massacre that connected them all. This is a show where personal vengeance collides with organizational conspiracy, where a teenager and a corpse princess fight against a system crumbling around them. Horror and action drive the plot, but character bonds anchor everything.