Claim: The characters Oko and Seiji, a clever man who is known to solve mysteries, run a lending shop in Edo, renting out old items.
Evidence: Tsukumogami Kashimasu (Japanese: つくもがみ貸します, "Tsukumogami For Rent") is a Japanese novel written by Megumi Hatakenaka and published in 2007. Okō and Seiji own and run the Izumo-ya lending shop in the Fukagawa district of Edo. Several of the items they lend are old and have become tsukumogami. Seiji is clever and, with the help of the tsukumogami, has a reputation for being able to solve mysteries and other difficult problems.