Dear Brother (おにいさまへ…) is a Japanese manga series written and illustrated by Riyoko Ikeda. It was adapted into an anime series that aired on the channel NHK-BS2 from July 14, 1991, to May 31, 1992.
The series originally started out as a manga in the early to mid-1970s. The story is about a 16-year-old girl, Nanako Misonoo (御苑生奈々子), who attends a prestigious academy and deals with life as a high school student via writing letters to her "brother". The manga has been translated into French, Italian and Polish. The series spans 39 anime episodes and three manga volumes, ending when Nanako is eighteen.
Plot
Nanako Misonoo is a young high school freshman at the exclusive girls' school Seiran Academy. When she begins her first year at this school, she falls into a world of female rivalry, love, chaos, and heartbreak. She narrates the story of the series in a chain of letters to a young man named Takehiko Henmi, who she calls "Oniisama" (Brother). In reality, Takehiko was her teacher at the cram school she went to earlier. She feels such a strong bond with Takehiko that she asks to continue corresponding with him. Takehiko agrees, and soon Nanako begins addressing him as "brother" in her letters. When Nanako starts her new school year at the all-girl Seiran Academy, she is unexpectedly inducted into the school's Sorority despite having none of the looks, talents, or background needed to become a member. As the series progresses, she becomes involved in the lives of the "Magnificent Three", the three most popular girls in the school.[1] As Nanako interacts with these ladies, she becomes attached to the great but troubled Rei Asaka, whom she wants to help, but cannot get close to due to Rei's obsession with Fukiko Ichinomiya, the Sorority president.