Maaya is a first year student at Umineko Shōgyō High School and a member of the school’s swimming club. She is also a fashion model.
Maaya lived nextdoor to Kaname when they were in elementary school. She remembers them hanging out a lot and doing many things together, while Kaname experienced it as being bossed around and bullied.
Maaya is a slender girl with small breasts and long orange and yellow hair. She also has a snaggletooth and painted fingernails. Most of the time she wears swimsuits with a flashier print than her fellow club members.
Maaya is arrogant, egocentric and spoilt. She tries to get things her way by manipulating people around her, especially the boys in the swimming club. She loves being the center of attention and knows how to become just that. She has the habit of referring to herself in third person. She feels inferior to girls with larger breasts (which means most female characters in the series) and is hostile towards them for that. Together with Makio, who has the same insecurity about her breasts, she forms an alliance, hoping to find a way to make their breasts grow. Ever since they were younger she has a crush on Kaname and because of that sees her fellow club members, especially Amuro, as rivals.
In the manga she has a personal trainer, Iori, who is a model as well.
Maaya transferred to Umineko Shōgyō High School after the three-way school competition.
After graduating from high school she continued modelling.
She is a very good swimmer. In middle school she was the national backstroke champion for two years in a row. She participates in 100 m and 200 m backstroke and medley relay competitions.