Asa is initially a quiet and unsociable girl. She dislikes her classmates, frequently wishing they would drop dead and spurning any offers of friendship. She has a very negative outlook on the world, other humans and Devils and tends to assume the worst of others. She has trust issues yet is afraid of loneliness but is also afraid of trying to approach someone as she believes she'll mess up and end up lonely again. She is the host for the War Devil, Yoru.