Himuro Renji: Nihon Touitsu

Overview

Renji Himuro is a man who has risen from a delinquent on the streets of Yokohama to become the young leader of Japan's largest criminal organization, the Kyowakai, with his sights set on unifying the entire Japanese underworld. One day, he receives an anonymous message. The message reads, “We are waiting for you, come alone," along with a picture of his only son all tied up. The lonely struggle of Japan's most powerful gangster begins… (Source: Young Champions Web, translated)

Source: AniList