At a university better known for ordinary student life than for ghost stories, Yakumo Saitou keeps his distance from everyone around him. Born with a mysterious red eye, he can see and speak with the dead, a gift that makes him an invaluable investigator but also isolates him from ordinary life, since each encounter can revive the loss and regret that linger after death. When Haruka Ozawa turns to him after a series of frightening incidents with clear supernatural overtones, she draws him into a growing string of cases involving murders, disappearances, and grudges that refuse to fade. As those incidents spread beyond campus, even the police are forced to pay attention, and Kazutoshi Gotou becomes one of the few officers willing to work with a detective whose witnesses are the deceased.
Together, Yakumo and Haruka move through mysteries where the living and the dead remain tightly bound to one another. Haruka’s determination keeps each investigation moving, while Yakumo’s strange gift gives them access to truths no one else can reach. Their cases uncover hidden motives, painful memories, and the unfinished business left behind by the dead, turning each haunting into both a crime to solve and a sorrow to confront. As Yakumo’s isolation slowly gives way to human connection, his partnership with Haruka becomes the emotional center of a series that blends detective work, emotional drama, and ghostly encounters while searching for closure when the answers lie beyond the grave.