At the subway station, Yuuji Abe has an unexpected encounter with a mysterious girl named Kana and her wolf companion, Rou. Little does he know that this meeting will entangle him in a sinister plan concocted by a group of half-demons known as the Seven Heads. Their goal is to create a utopia where humans and demons can coexist peacefully, regardless of the ruthless and coercive methods they use to achieve it.
As the Seven Heads set their sights on Kana and her companions, Yuuji delves deeper into the truth about Kana and his own ancestry. Along the way, he begins to come to terms with his growing feelings for this enigmatic girl.
