A few days after the murder of Hiroki Yoshihara (Ryohei Abe), the president of the disaster prevention venture company 'Kyoto Rescue Service (KRS)'-Kazuo Nakahara, the father of Vice President Aimi Satsukawa, is at home. Found dead. It was
Satoshi Itomura (Takaya Kamikawa) is interested in the handmade caramel left on the scene, but is surprised at the exquisite taste that the bitterness spreads in the sweetness. How, 'wasabi' was used for the caramel.
At the scene, there is a suicide note stating that it was himself who killed Yoshiwara, and that everything was thought of Nami, and one man who was guilty of guilt drank poison himself and died. It seemed to be a suicide note. However, from a certain evidence found by Itomura, it is possible that someone killed the first son by pretending to be a suicide after being accused of killing Yoshiwara, and the members of the Special Investigation Countermeasures Office started the investigation again as a serial murder. do.
However, just before that, the fact of the shock that Kazuo hid was discovered! Using the wasabi used in Caramel as a clue, Itomura discovers the truth behind the serial murder and the unexpected incident behind it.