Shoko Kaoji, a college student, is known for his bitterness and distance from others. But everything changes when he meets a persistent girl who refuses to give up on him. Slowly, through her unwavering support, Shoko begins to open up and transform into a more caring and approachable person. However, this is just the beginning. The story takes a darker turn with the mysterious involvement of the Blade of Izanagi, leading Shoko down a path much deeper and more dangerous than he ever imagined.