Sayaka Tsuruta

The Hyodo-gumi boss—part of Tendokai, Japan’s largest yakuza syndicate—has been brutally murdered. Kazuma Washio (Hitoshi Ozawa), the head of the Washio-gumi and Tendokai’s wakagashira (underboss), is convinced that Yoshinari Myojin (Sho Aikawa), a former Tendokai wakagashira-hosa now running Tokyo’s underworld of thugs and mafia, is behind the killing. Around the same time, Tendokai's 5th-generation chairman Katsushige (Hakuryu) orders Washio to secure a woman named Nagi Toyama (Akane Hotta). Washio sets out with his men, Okita (Yasukaze Motomiya) and Date (Hideo Nakano), but they’re ambushed by a group of heavily armed youths. Barely escaping, they manage to bring Nagi to their hideout—only to discover she’s a key player in a power struggle over the Tokyo Casino Project. And so begins the greatest conflict yet, entangling yakuza, mafia, street gangs, the police, and even the state itself—

After the death of previous Boss, a gang war lasts for more than four years.

Seeking the "woman of his dreams", Kikunosuke visits Hokkaido and meets Masumi, the only daughter of the Zippi Ranch that raises great racing horses, Okamura, her grandfather, and Yamada, a stable hand who is secretly in love with Masumi. Zippi Ranch is targeted for acquisition by Sengoku Farms, which has constantly acquired small ranches. Naoto, the son of Sengoku, grew up with Masumi and raped her in the past. With the horrible experience, Masumi has become fastidious about sex. Began working at Zippi Ranch, Kikunosuke spends a night with a hostess, Ayumi, whom he met at a club Naoto owns. Sleeping with numerous customers to support the club, Ayumi has been sexually frigid, but Kikunosuke gives her an orgasm with his technique, Kinuta. The sex master, Kikunosuke, stands up to rescue a troubled woman mentally and physically.

Third son Raizo is a good man, but when another organization targets his father and his family business, it awakens his violent side.