- A Murder case has occured and the police is unable to find loopholes in the main suspect's alibi, Hanaoka Yasuko thus creating obstacles in the investigation. Kaoru Utsumi again sought the help of Manabu Yukawa, who, seeing the case has nothing to do with physics, initially refuses to help.
However, after a reunion with the genius classmate, Tetsuya Ishigami, whom he has high admiration for and who is also the neighbor of the main suspect, he senses that Ishigami is in love with Hanaoka and decides to investigate the case on his own.
He succeeds in cracking the case only to reveal a sad and shocking truth that will do no good to all parties save the police. Despite having a reputation of being emotionless when solving cases, this time Yukawa is much affected by the outcome.