Before meeting Yoh, Anna's mind reading power known as reishi (soul sight) was one that she could not fully control. She could not help but pick up the negative emotions of others every time she was around other people; because of this, she began to hate others, and this hatred would involuntarily manifest itself as an Oni (demonic ogres, akin to boogeyman in Western cultures). Thus she tried to avoid going out as much as possible, usually confining herself to her room.