Satoshi Suzusaki is a private detective vacationing at a secluded ski resort with his adopted daughter when a fierce storm isolates them. After a fellow guest is brutally murdered, Suzusaki launches an investigation to find the killer. His inquiries uncover dangerous secrets and compromising backgrounds among the other guests. Simultaneously, the investigation forces him to confront and discover previously unknown aspects of his own personal history. As Suzusaki pursues the truth, suspicion turns against him, and other guests begin to accuse him of the murder.

His background defines him as both a private investigator and an adoptive parent. Throughout the narrative, his development involves the dual struggle of conducting the murder investigation while defending himself against mounting accusations. The revelations about his own past form a significant element of his character arc during the resort events.