A theme song for the film under Yen Town Band, titled "Swallowtail Butterfly (Ai no Uta)", topped the Oricon Singles Chart on October 7, 1996.

The Japanese natives, however, despise the nickname, and in retribution call the immigrants by the homophone Yen Thieves (円盗, en tou), anglicised as "Yentowns" in the film's English subtitles.

Ageha does not participate in many of these activities, but is protected by Glico and the other immigrants, including the Chinese auto mechanic scammer Fei Hong (Hiroshi Mikami), American ex-boxer Arrow (Shiek Mahmud-Bey), and the mysterious broker Ran (Atsuro Watabe).

Eventually, due to a sudden twist of fate involving the discovery of a rare cassette tape (containing Frank Sinatra's "My Way") that the mob is after, as well as a counterfeit money scheme strategy, the immigrants are given a chance to realize their various dreams.

It covers the journey of Ageha and her other immigrant companions as they bond, try to survive in the cruel underworld that is Yentown, establish their very own music club, revel in fame and money, encounter the mob, and, above all, find a true identity for themselves.