Based on a popular otome game, Hakuouki follows Chizuru and the Shinsengumi in an alternate reality. Chizuru travels to Kyoto in search of her missing father but, after being involved in an incident, she ends up being taken in by the Shinsengumi where she meets the members including the famous Hijikata Toshizou and Okita Souji. Chizuru’s father was conducting government research for strengthening the Shinsengumi and developed the ochimizu. The ochimizu is a formula that gives demon-like strength and regeneration effects, but once taken, the user experiences extreme pain and eventually turns into a blood-thirsty monster.