Masato has never stopped searching for Sena, the lover who vanished without warning years ago. One night on his way home, Masato passes by a public restroom in a park and hears voices inside. When the door opens, he finds Sena with blood smeared around his mouth, and inside a man lies unconscious with bite marks on his neck. Stunned yet relieved, Masato drags Sena away and demands answers. Sena confesses that he has a peculiar condition: he is drawn to the taste of blood, especially the blood of someone he truly loves. The reason he disappeared was to protect Masato from his own uncontrollable desires. Despite this revelation, Masato refuses to let go. The story follows their tense reunion as they navigate Sena’s unique urge and Masato’s unwavering devotion, leading to a relationship built on obsession, secrecy, and a hunger that binds them together. Set against a contemporary Japanese backdrop, the narrative unfolds through flashbacks revealing the six years they spent together before Sena’s disappearance, while the present teases the dangerous circumstances surrounding Sena’s condition and the mystery of why he returned.