In the city of Rakkachou, which some call "Yakuza Town," high school student Megumi comes home to discover that her beloved dog has been brutally killed by a depraved individual. This act was intended to force her mother to sell their house to loan sharks. The incident catches the eye of Hiromasa "Nine" Tsukumo, an odd character who is trailed by a powerful, disfigured creature that no one but Megumi appears to notice. As Nine attempts to form his own yakuza group with the goal of shielding the innocent residents of Yakuza Town, he slowly guides Megumi toward the ultimate truth of their world.