Youseiki Suikoden  

妖世紀水滸伝

In the early 21st century, Tokyo was devastated by an earthquake which resulted in Japan losing its central hub of government and commerce. The aftermath left the country lawless. Takateru Suga, searching for his kidnapped sister, discovers that she has been taken by the powerful Koryukai gang. Determined to rescue her, he teams up with a drag queen, two ex-mercenaries, and a nun to dismantle the criminal organization and bring them to justice.