With the kuitan and Ryōsuke unsure of what to do, Momo and Igarashi dropped by and notify that they were running after a suspect who killed an Italian chef.
Meanwhile, a diplomat Raymond from an oil-rich country visited Chief Yamada and urgently requested police to find the whereabouts of their prince.
Subsequently, the kuitan found Shiketa in another restaurant and obtained an important clue to the mystery of the food, tofu skin.
Igarashi, who was hurt by his beloved daughter’s cancel of a long-awaited meeting that arrives only once a month, received a message that the president of a sarakin company was murdered.
The crime scene is the company’s office, where the suspect left his bag that contained his lunch and the picture of a family with a little boy.
Momo became furious when she caught his action, but the kuitan began searching exactly the same lunch box sold in the neighborhood.
Igarashi with the suspect’s picture in his hand ran into a middle aged man who were staring at the window display of a doll for Children's Day.
The kuitan agreed to take care of Momo, who was a bit wore out from overwork, with the request of Chief Yamauchi, who visited the Holms Agency office.
The kuitan and Ryōsuke expected her to cook for them while Kyōko is on a business trip to Europe, but Momo was only thinking about the case she was investigating.
Helping Momo, who ignored the chief’s order, the kuitan accompanied her investigation at the crime scene and found a large burnt pot full of curry.
A middle-aged woman, Kurara Sonoda, visited the Holmes Agency and requested to background check on a man called Kameda.
Just as they were about to eat Kantō-style Red bean soup, news that Kameda killed his company’s president reached the two.
Momo and Igarashi told that Kaneda was harshly reprimanded by the president prior to his murder and did not have an established alibi.