Naoto discovers that his deceased love, Suzune, has returned by possessing the body of a girl named Ayumi through a generational family curse and a mysterious ring. To facilitate Suzune's full restoration, Naoto engages in an intimate relationship with Ayumi, who willingly acts as a vessel for her friend's soul. However, their fragile reunion is suddenly interrupted by a dangerous event that mirrors the accident that originally claimed Suzune's life.