Seiya and his friends are asked by Nonomura Shigezo, the chairman of a restaurant chain, to find a croquette they remember eating 20 years ago. However, the Raccoon Bridge shopping district, where the croquette store Kameya used to be, has been hit hard by redevelopment, and the store has moved to a new location and is nowhere to be found. Kyoko tries to gather information via the Internet, but she begins to receive phone calls threatening to stop her search for the croquette store, and she begins to receive unwanted phone calls. After consulting Momo and Igarashi, Seiya and Ryosuke learn that there was an incident 20 years ago in which a man fell to his death in the Raccoon Bridge shopping district, and that Kameya was involved.