A Man Drawn into the Heart of the Underworld

The year is 2007. Yoshitaka Mine had once launched a successful startup, only to be stabbed in the back by a trusted partner.
Wandering Kaumorocho in a drunken stupor, he witnesses a gruesome conflict between yakuza factions. After watching a subordinate of Daigo Dojima sacrifice themselves, Mine longs to discover what makes a bond transcend material gain.

He approaches Tsuyoshi Kanda of the Tojo Clan's Nishikiyama Family in hopes of learning more about Daigo. Kanda welcomes him in as his sworn brother and right-hand man. Working in tandem, they bring significant wealth into the family's coffers.
Soon, the Tojo Clan catches wind of Mine and Kanda's actions and springs into action. As Mine and Kanda navigate their way through this crisis, Mine begins to feel a sense of kinship toward Kanda.

As Mine ponders whether this is the unshakeable bond he'd been searching for, he receives a sudden invitation from Daigo Dojima.