Villain: Perpetrator Chase Investigation

Saeki Shuichi was a detective, but he quit his job. He now works at a detective agency. One day, a couple asks the detective agency to find a man named Sakagami. The man killed the couple's son and served at a youth detention center. Kogure Masato is the director of the detective agency. He tells Shuichi to work on the case. Shuichi is also part of