Mari Hayase (早瀬 真理) is one of the main characters of the series. She is the daughter of a great patissier and a brilliant scientist. She is the eldest daughter of the family, and she has one younger sister.
Mari has a brown eyes and purple hair. She wears a white shirt with a sleeve cuffs, blue high-waist skirt with suspenders and white thigh highs socks with black Mary Jane shoes.