Five people trapped on a completely isolated island on land. A mystery deepens as the truth about the real culprit hiding among them begins to unfold. Female detective Asuka Kagura (Sachiko Suzuki) had been chasing a certain man. He was suspected of kidnapping, confinement, and sexual assault resulting in the death of a female college student, but due to insufficient evidence, he was never prosecuted. Why has he been brought to this island? Suspicion grows that he might be the culprit. The locked-room situation on the remote island becomes the key to uncovering the truth behind the crime.