[Machine Translation] A human bone, about 200 years old, was found at a condominium construction site. One of the ribs had a puncture-like mark, apparently from a murder victim. At the request of Udagawa, the scientific analysis lab that examined the bones and the remains, time-space travelers Oyuko and Yuka Sekiguchi begin investigating the murder in Edo, which has not yet been made into a case. Meanwhile, Denzaburo, a deputy in the Minamimachi Magistrate's Office, hears a rumor that the young master of a paper wholesaler is having an illicit affair with the Hatamoto's wife...