Ikuo and Tatsuya grow up in an orphanage, tragically witnessing their beloved teacher's murder. Years later, Ikuo is now a detective while Tatsuya leads a crime syndicate. Resolved to find the perpetrator, they can only trust each other.

Orphans who live in a shared home for such children attend the same elementary school and witness their teacher slayed. The police take note of their accounts. The case remains unresolved into the boys' adulthood where the two, now on different paths, nonetheless share the goal of resolving the matter.—aghaemi