During the turbulent Bakumatsu era, the Shinsengumi defend the capital city, Kyoto, and the Tokugawa Bakufu. Its vice commander, Hijikata Toshizo, is a man everyone has dubbed "the demon." The top Shinsengumi swordsman, Okita Souji, looks up to Hijikata and swears to see to the achievement of his vice-commander's dream. But deep within Okita resides a man who hates Hijikata with a passion, and that persona is about to awaken...