- Popular songwriter Zaitsu Yoichi is murdered. Oda Miyuki, who launches an investigation together with Sone Takeo, the head of Homicide Squard's Section, lays eyes on a suspicious-looking man carrying a backpack. He is Itomura Satoshi, a chief Investigator in the Scientific Criminal Unit (commonly called the "Lost Articles Section").
According to her senior, Miyashita Haruhiko, "nothing good happens when he is involved". However, he pays no heed to his reputation among the people around him. Itomura is striking the keys of a broken toy piano left at the scene... A list has been made of Zaitsu's personal effects such as his digital recorder and music scores, but itomura wishes to add the toy piano which Zaitsu had treasured since he was a child, to the inventory of personal effects. That's because these are the personal belongings that are most familiar to the victim. However, it is not acceptable to Sone. Itomura listens to the songs in the recorder and gazes at the music scores. Furthermore, he tries to repair the toy piano...
What is Zaitsu's true face that Itomura has found out from those personal items? and what is the truth and the hidden feeling behind Zaitsu's murder?