Kahori Mirumachi, a lawyer, repeatedly finds herself in problematic relationships. Despite her "no cheating" rule, she unknowingly starts an affair with Sunagoya, a high school teacher in the midst of a divorce.
A couple of months have passed since the serial murder case. A new dead body is found in the same area. Detective Manabu Kagaya tries to find the truth. He goes to see serial killer Yoshiharu Urano in prison.