Revolver Lily

Yuri became a spy at the age of 16. She killed 57 people over a period of 3 years. Now, in 1924, she runs a small bar in Tokyo. Shinta is a boy whose family was murdered. He holds a key to the missing funds left by his father and that belonged to the Imperial Japanese Army. Shinta asks Yuri for help. They soon become the target of 1,000 soldiers.
(Source: AsianWiki) ~~ Adapted from the novel "Revolver Lily" (リボルバー・リリー) by Nagaura Kyo (長浦京).