Very cheerful, she cooks very well and loves her brother, Yu Otosaka, she wakes him up and cooks for him everyday, shes very compassionate and friendly, she gets nosebleeds when shes overly excited, likes to cook omlette rice with pizza sauce for her brother to remind him of mom, who died, Yu dislikes the sauce but eats it because Yu cares deeply for his sister. 

Ayumi is a young girl with waist-length dark brown hair, light violet eyes, and usually wears an apron when her brother's home.