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Igarashi is heartbroken when his beloved daughter Rei stands him up on their once-a-month date, when he receives a call that the president of a loan shark company has been murdered. The crime scene is a salaried bank office in a small building in Yokohama City. The murderer had fled, leaving behind a bag containing a commercial lunch box and a family photo of three people, including a young boy. Momo, who investigated the crime scene with Igarashi, suspects that the crime was committed by someone who was pressured by the president to repay a debt. Meanwhile, Seiya shows up at the scene and eats the lunch box as evidence, taking advantage of Momo and the others. Momo notices this and gets angry. However, Seiya, after being driven away from the crime scene, went around to lunch box shops in the area and started buying lunch boxes in the same containers. Igarashi, investigating with a photo in hand, finds the suspect, Tsujitani, looking at a Dragon Boat Festival doll in a show window.