Hayato Kyouko

A 27-year-old teacher at the all-girls school. She is very tall and beautiful yet acts somewhat childish which makes her popular among her students. Her favorite student is Momoko, with whom she is infatuated. She often hangs around with Momoko after school and allows her to stay at her place. She has a hard time with money due to her expensive tastes but remains constantly upbeat. After seducing Momoko in her apartment she is struck terribly ill and is forced to resign from school.

(from wikipedia)