Ahead of a bid for a major renovation project for Edo Castle, Zenzo, the master carpenter of Tomoeya, one of Edo's first and second carpenters, became seriously injured after being crushed under a piece of lumber that had collapsed in the lumber yard of Hidaya, a lumber merchant. . Choshichiro, who was just passing by and rescued Zenzo, saw a suspicious man running away from behind a tree. What's more, there were marks on the rope that had tied the timbers together, where they had been cut with a knife. Immediately, Yumegakudo posted a portrait of the man and began searching for the suspicious man. Tatsuzaburo soon discovered it and followed it, but lost it near the carpenter Fujiya Kogashira Kanezo's house.