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A young girl confined to a wheelchair and living in a castle with Prof Ichigo, she often appears to be either emotionless or angry. Mayu is able to see the guardian beasts and other spirits for who they are, sometimes she is the only one to sense something wrong. Her mind is often described as "a blank", and one time Fuuto sees her connected to several machines during a 'minor sickness'. Her voice has the uncanny power to stop Fuuto from using his power to destroy his surroundings whenever he is angry, and often she is the one who calls him back from whatever time or dimension he has been transported to.