Lady Snowblood 2: Love Song of Vengeance

The vengeful swordswoman, Lady Snowblood, is conscripted by the Japanese Secret Police to assassinate political dissidents in order to avoid a death sentence for her prior acts of bloodshed.
Yuki Kashima is surrounded by police officers on a beach. She fights and kills several of them but is overwhelmed. She is quickly tried and sentenced to death by hanging but is suddenly rescued by the mysterious Seishiro Kikui, head of the Secret Police. Inside his headquarters, he propositions Yuki to spy on an "enemy of the State", the anarchist Ransui Tokunaga. Ransui is in possession of a critical document which Seishiro seems quite obsessed with, deeming it highly dangerous to the stability of the government. If Yuki can obtain and deliver the document to Seishiro, he will grant her immunity from her charges.
Yuki infiltrates Ransui's home, posing as a maid, and sets about looking for the document. But the more she observes Ransui, the more she questions the path Seishiro has put her on. When Ransui confides in Yuki, knowing full well who she is, asking her to deliver the document to his brother Shusuke, Yuki will be forced to decide her allegiance.
(Source: Wikipedia)
~~ Adapted from the manga series "Lady Snowblood" (修羅雪姫) written by Kazuo Koike (小池 一夫) and illustrated by Kazuo Kamimura (上村一夫).