When you look at the picture you found in the lake, something blue is drawn that is not in the actual scenery. Takeda (Kinya Kitaoji) and Murai (Yasuko Tomita) investigate the visitors to the museum that Sawako (Juri Ueno) has visited, and find a photo of a blue car. Behind Sawako walking towards the car, next to her is a man with a back view. After re-examining Sawako's diary, he learns of the existence of Sato (Yuma Kusakawa), the man who was driving the blue foreign car at the time. When the two find the car in the picture at a junkyard, a message from Sawako is in the trunk of the car...