His father, whom he thought dead, is actually the boss of the Hong Kong mafia---!? One day, Iba Takayuki, who’s living a quiet and normal high school life, is awaited by men in black suits. In return for taking over an enormous inheritance, he has to avenge his killed father. On top of that he has to fight with his stepbrother Arthur, who’s the same age as Takayuki, for the inheritance!? To make things worse, he falls in love at first sight with beautiful Arthur who openly shows his hostility towards Takayuki....!? Together with his able guardians Jason, leader of the armed faction, and cool military staff member Craig, he’s about to stumble into the love and conflict between brothers against the odds of the black society of Hong Kong!!