Tadaima Jugyouchuu!(1980)

Ichimonji Ai is a teacher starting her first day of work. She’s kind of new at this, but she does have confidence. Even though she was late on her first day, made the big tough-looking boy cry, slipped off the stage at her introduction to the school, nearly passed out in the bathtub, and still lives with her parents, just maybe she’ll get her students through the rigors of high school, and win the heart of the fellow teacher Kurada…
(Source: Animeraider)