Three years after the three-way gang war between the Moon Wheel, Moon Halo, and the rogue factions, the underworld has settled into an uneasy calm. The once-dominant Moon Wheel syndicate has been reduced to the smaller Moon Wheel Group, but the surface peace is deceptive. Unaffiliated thugs, foreign criminals, and shadowy figures known collectively as "various guys" are operating unseen, slowly poisoning the city from beneath. The story follows Roquemasa and his loyal crew as they struggle to find a new direction for the next generation of leaders, while old enemies and new threats close in.

A pivotal moment occurs when Shu, a key member, narrowly escapes death at the hands of the executive Yamashiro. In the chaos, the turncoat Bessho is killed, inflaming Roquemasa and his Moon Troupe with fury. The incident sets off a chain of betrayals, brutal confrontations, and shifting allegiances. Figures such as the cunning Chacasin and the ambitious Noetani Hidetaka enter the fray, each maneuvering to reshape the power structure. As the Moon Wheel Group, the Moon Halo faction, and the emerging Heart Society clash, the line between righteous yakuza honor and ruthless ambition blurs. The narrative arcs through escalating violence, personal vendettas, and the search for identity in a criminal world that is rapidly changing, setting the stage for a full-scale war over dominance.