An Angel's Heart

This is an action and criminal story of Yakuza, but the hero is an ordinary house keeper. When Takashi Nagumo was a high school student, he was attacked by street gangs. Luckily, a very impressive and strong guy, Ryuusei Kuragano, saved him. After three years, Takashi becomes a house keeper and is suddenly involved in the money trouble of his friend. His friend escapes with a large amount of debt and he made Takashi is his surety. Then the yakuza takes Takashi to their office and demands him to work at the house of head of Yakuza as a house keeper until his friend would be found. Takashi meets Ryuusei again there... (Source: slash-kun)