In near-future Japan, an isolationist Edo Country has appeared. Tatsujirō, a university student admitted after a severe selection process, serves Magome Harimanokami, the Nagasaki magistrate known as Konparuya Gomesu, and investigates the cause of the lethal epidemic called oni-sekiri.

In the isolationist Edo Country, the university student Tatsujirō pursues the cause of an epidemic.

After finding a map in the room of a former lover who died by suicide, the narrator is led to a lodging house where wounded people come to confess. Working there as a listener and falling in love with a resident named Ipp, the narrator confronts the town's secrets and a pursuing past.

At a lodging house for confessions, love and secrets converge in a single incident.