If you're looking for anime similar to Hadou no Mon, you might like these titles.
Kubota and Hachisuka meet up by accident in a Middle Eastern desert and return to Japan together to hustle their way through life. They start by getting involved in shady TV dealings, where they get jobs making fake documentaries.
Being the only son of the leader of the largest criminal organization (yakuza) in Kanto area, Shizuya Kondou chose not to join the gang and became a rookie designer of an underwear company. However, the assassination of his father forced him to inherit the gang, with one condition: keeping his day job while hiding his true identity from his coworkers, including an aspiring female designer, who is his love interest as well as the only person capable to keep his violent instincts contained.
Yoshino grew up as the yakuza princess of the Osaka Somei crime family. Everyone left her alone due to her sharp gaze and mobster ties. But when her grandfather signs a truce with the Tokyo-based Miyama crime family, she’s offered for betrothal to the Miyama leader’s grandson, Kirishima. At first, Kirishima seems amiable and polite–but when he shows his dark side, he proves to be more disturbing than any gangster Yoshino has ever met. This engagement is sure to be a wild ride for a tough yakuza princess and her twisted yakuza prince!
Shinjuku gangster Sabu and his young wife Koiko try to live a normal life, despite the interferences of gang politics and criminal deals. After she saves his life, Sabu's gang-boss, Tominaga, falls in love with Koiko, and sends Sabu into increasingly dangerous situations, hoping to cause his arrest, and thus obligate himself to "take care" of Koiko while Sabu is in prison.
The Headless Rider receives a mysterious red bag that creates big trouble. The Yakuza chase a gangster, and a wagon disappears on the highway, pursued by suspicious men in black suits. Mikado and his friends should be enjoying the summer festival, but have been swept up in the events. And, finally, a mysterious radiant object appears in the night sky over Ikebukuro...!?
Experience the life of a young member of the Japanese mafia. Our main character, Maji, lives his daily life as part of the Nagisa-gumi, protecting the locals and running their turf. He may not be the smartest man in the world, but he has the guts and attitude to become a great Japanese mafia member.