- HD 1080
- Runtime: 148m.
- Status: Released
0
- Languages: ja
- Country: Japan
- Director: Shunji Iwai
- Stars: Ayumi Ito, Yosuke Eguchi, Chara, Hiroshi Mikami, Andy Hui Chi-On
- keywords: money laundering, immigration, money, counterfeit, illegal prostitution, music, alternative tokyo, multicultural
- Production_studio: OORONG-SHA, Pony Canyon, Nippon Herald Films, Fuji Television Network, Ace Pictures
- Slogan: This is the story of Yentowns in Yentown.
- The Swallowtail Butterfly is featured in the top rankings of 1996
- #15 in Top Drama Movies of 1996
- #10 in Top Crime Movies of 1996
The struggles of a group of outcasts living in "Yentown", in an alternate-future Japan.