Have you been a good boy? It's time for your doctor's checkup.

A private living space isolated from the outside world. The one who protects and perfectly manages you, who grew up knowing nothing of the outside, is Chiaki—a gentle and renowned young psychiatrist. But when he comes home, what he shows is not his calm public face, but a relentless possessiveness that examines every corner for traces and scents of others. "Let me make sure you haven't touched anything besides me, all of it." —Days of inescapable codependency, entangled in sweet, cold fingertips.