When Kogoro and others went to Songjiang, they met a gathering of serial sentence lovers. The lovers of serial sentences broke up because the lottery decided the place where everyone sang. Since then, the series of meetings started as scheduled, but one of the members, Niu Wa, was killed. Although he was killed, even the sentencing meeting was held as scheduled. Kogoro and Conan also participated in the activity, and Conan reasoned the mystery of the incident.