On a winter night in 1995, Mikiya Kokutou encounters a young woman donning a striking white kimono and an enigmatic expression; Shiki Ryougi. Mikiya's curiosity is piqued by Shiki's elusive smile, and their paths cross again during Mikiya's spring high school entrance ceremony, leading to a conversation over lunch. As Shiki divulges more about her peculiar past to Mikiya, he grows increasingly captivated. Nevertheless, the tranquility of Mifune City is shattered by a succession of violent and gruesome murders that leave the police stumped. In a bid to protect Shiki from any possible harm, Mikiya vows to keep a watchful eye on her. However, as the investigation takes an unexpected turn, Mikiya is drawn into a hazardous web of secrets and dishonesty. The terrifying revelations he uncovers will have an enduring impact on his life.