Seiya and his friends are asked by an elderly woman, Yamada Fusae, to search for her grandson, Kohei, who has borrowed money from a loan shark and is on the run. According to Fusae's story, Kohei is trying to kill someone. Fusae stays overnight at the office and watches over the search while cheering up Seiya and the others with her signature dish. Meanwhile, Kyoko believes that Shizuo Matsumoto, the don of the money-making world, is Fusae's first love, and arranges a reunion. Fusae learns of this and begins preparing food with a smile on her face. However, Kohei's found story reveals that Fusae is trying to poison Matsumoto, who is tormenting Kohei.