In the city of Rakkachou, also known as "Yakuza Town," Megumi, a high school student, returns home only to find her beloved dog brutally murdered. The culprit's intention was to use the violent act as leverage to force Megumi's mother into selling their house to some unscrupulous land sharks. As the chaos unfolds, Megumi catches the attention of someone unexpected - Hiromasa "Nine" Tsukumo. Nine is an enigmatic character followed by a powerful creature with grotesque features that only Megumi can see. Nine's mission is to create his own yakuza group to defend the innocent residents of the town. By joining forces with Nine, Megumi is drawn closer to discovering the truth about their world.