Aya Rindou 輪堂鴉夜

A young Heian era woman and a yōkai, who is beheaded by an unknown half-demon assailant from Britain and has her headless body taken away. Since she is a demon, she cannot die (though being decapitated by a half-demon means she cannot heal herself) and thus her head continues to live on, ultimately seeking support from Tsugaru to search the assailant and take revenge.