Kana. Yuuji Abe encounters a mysterious girl named Kana at the subway station. She and Rou, her wolf friend, entangles Yuuji in a plot created by the Seven Heads, a group of half-demons who aim to build a kind of utopia where humans and demons can live together in harmony, albeit through unscrupulous and forceful means. As the Seven Heads targets Kana and her companions, Yuujo starts to find the truth not only about this mysterious girl, but also about his own ancestors. Eventually, he gets to grips with his budding feelings for Kana.