After her father is murdered, Komugi Yamashita finds a letter naming a suspect as innocent. The suspect is the son of a criminal executed 22 years ago. Seeking help from lawyer, she uncovers shocking truths about her father's past.

Before he was a protector, Kenshin was a fearsome assassin known as Battosai. But when he meets the gentle Tomoe Yukishiro, his story begins to change.