Avsnitt 4

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.