The Teen Novel That Smells Like Guilt

This time, Kogoro took over an unusual affair, from a well-known novelist who specialises in teen novels particularly, named Chu Masamura. He requested Kogoro to investigate regarding a deceased, who is called Taizo Yasuki, who died recently during a car accident. He persistantly emphasised his need, to ascertain all of the late Yasuki's friends and acquaintances, especially those "questionable" ones.