Yakuza is an action-adventure video game developed and published by Sega for the PlayStation 2. It was released in 2005 in Japan and in September 2006 internationally. The story follows Kazuma Kiryu, a yakuza who spent ten years in prison for a crime he did not commit. After being released, he learns that the criminal underworld is searching for 10 billion yen that has been stolen from the Tojo clan. He comes across an orphan named Haruka who is being targeted by the clan. She is believed to have the key to their lost money and Kiryu resolves to protect her. The game takes place in Kamurocho, a realistic recreation of Tokyo's Kabukicho district.

Kazuma Kiryu is a fictional character and the initial main protagonist of Sega's action-adventure beat 'em up Japanese role-playing game series Yakuza / Like a Dragon. He is popularly known as "the Dragon of Dojima" due to the tattoo of a dragon on his back and him originally being a fearsome member of the yakuza group known as the Dojima Family, a subsidiary of the Tojo Clan. He was introduced in the series' 2005 debut game, where he took the blame for his boss's death to protect his sworn-brother Akira Nishikiyama, resulting in his expulsion from the clan and a ten-year stay in prison. After leaving prison, he fights against the new threats in his life, during which he meets Haruka Sawamura, to whom he eventually becomes an adoptive father. He is voiced by Takaya Kuroda in Japanese and by Darryl Kurylo and Yong Yea (2023-present) in the series’ English-dubbed releases. Besides the main series, Kiryu has also appeared in two “Like a Dragon” live-action films, as well as other video games including Project X Zone 2 and as downloadable content in the spin-off game, Fist of the North Star: Lost Paradise.