Plot synopsis: A TV drama based on Hideo Yokoyama's short story "Gyakuten no Natsu". A first-class suspense depicting the darkness of the mind of a man who has unfortunately committed murder and is once again lost after a single phone call. Sato Koichi plays the conflict of a man who lives hard even though he has a big darkness in his heart, and it is a work that resonates with the hearts of the viewers.