Dear Brother is a tV series anime that premiered in summer 1991, produced by Tezuka Productions.

About the production: the story comes from a manga, there are 39 episodes of about 25 minutes and its current status is "finished".

Its main genres are drama and psychological, with themes such as Shoujo, School, Ojou-sama and Coming of Age.

On AniList, Dear Brother has an average score of 79%, a very good score, and appears on 22,097 users' lists.

Before leaving her cram school, Nanako Misonō asks one of the teachers if they can become pen-pals. The teacher, Takehiko Henmi, is reluctant at first, but eventually accepts the offer. The story is narrated through the letters sent from Nanako as she enters Seiran, a renowned private high school for girls only. There she encounters many difficulties as an ordinary middle-class girl invited to the prestigious Sorority, the most traditional and sophisticated club on campus.. (Source: AnimeNewsNetwork)

Official synopsis from AniList.