Ayumi, Miss

Miss Ayumi teaches at Graviton High School, where A-ko, B-ko, and C-ko are all in her class simultaneously. Consequently, her duties involve trying to get C-ko to study while stopping A-ko and B-ko from killing each other.
It is later revealed that Miss Ayumi harbors a secret melancholy. With both parents deceased, she fears she will never find love, which prompts her fateful choice to accept an arranged marriage to Kei.
Miss Ayumi also belongs to the Volunteer Defense Force, a loosely organized group of altruists who protect the city when official authorities fail. When the fight between A-ko and B-ko triggers a citywide alert in "Cinderella Rhapsody," she immediately puts on a bizarre superhero costume and rides a gravity-defying cycle into battle. Her revealing outfit is a remnant from the era when Project A-ko was intended to be an adult series.
Miss Ayumi is based on the protagonist of the TV series Creamy Mami, one of several magical girl shows released in the 1980s.
Miss Ayumi's subject seems to be literature. She enjoys fireworks displays and is an enthusiastic swimmer.