Asa is initially a quiet and unsociable girl. She dislikes her classmates, frequently wishing they would drop dead and spurning any offers of friendship, and she would prefer to study over making friends. She dislikes all Devils as a result of her parents being killed by one. Asa later realizes that she was truly jealous of her peers, and wanted to fit in with them as well. After Asa becomes the host of the War Devil she gets a second chance at life and resolves to live more selfishly.