Swallowtail Butterfly

An industrial section of Japan got the name of Yentown as many immigrants come to make money and hope to go home rich. A small group of people in Yentown try to work together to survive, there is a girl named Ageha who has no family, Glico the hooker, Fei Hong a poor immigrant from Shanghai, Arrow an ex-boxer from the US and Ren the mysterious guy who seems to know too much about guns. Fortune shines upon them when they find a cassette that we'll get them rich but along with money trouble will always follow.
(Source: Asianwiki)