Shinichiro Hanasaki, a former detective with the police department, is currently engaged in running a nursery called “Smiling Garden.” He wishes to help poorer families and single parents by offering very low fees for childcare, but this leaves the nursery struggling financially. To replenish the budget, Shinichiro decides to open a private detective agency at night.

Heinous crimes occur along a street called Chaos Street in Japan. Even the police have given up on policing the street. Yet there are killers who even the criminals there are fearful of. Requests for killings are made via an old cabaret. These killers are also beautiful women.

Mai (Rika Adachi) is a high school student. She attends a new school and there she meets her classmate Shino (Manami Enosawa). Shino was bullied by Mai's friends back in their middle school days. Table have now turned.