Hiromi Minoshima

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.

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.