Ever since middle school, Shion had been mocked as "human toilet" for being a bullied outcast, enduring daily harassment from local thugs. One fateful day, she crosses paths with Masato, the supreme leader of Numekomamajyo—the largest biker gang in the Kanto region. This encounter drastically changes her life. A plain, ordinary girl gradually rediscovers her true self and grows stronger within the powerful world of biker gangs. A gripping story of how she begins to walk her own path and transform her life against all odds.