In 1860's Edo, Japan, 16-year-old Chizuru Yukimura lives a simple life as the daughter of a doctor. When her father's work takes him away from home and into the capital of Kyoto, Chizuru is left alone with only the letters from her father as a means to stay in contact with him. After the letters stop coming though, Chizuru becomes gravely concerned. Disguising herself as a man for safety, she travels to Kyoto to find him, only to find herself being attacked by a group of samurai and a strange, almost inhuman man. Chizuru is saved by a mysterious member of a group known as the Shinsengumi, but because of what she witnessed, she's taken back to their base of operations to be interrogated and possibly silenced…forever.