This early 90's anime addresses several controversial issues (especially considering the original manga was published in the 1970's) including drug abuse, homosexuality, bullying, incest and suicide. The story is set in a prestigious girls' highschool where the student body is obsessed with the school's Sorority and its leading members, dubbed "The Magnificent Three". The main character, Nanako, is a new student who became caught up in the affairs of the three most popular girls on campus and, with the help of her best friends, unlocks the secrets of their past as well as that of her own family. The title refers to the letters that she writes to her "brother" throughout the series, sharing with him the trials and tribulations of her highschool life.
While this series can be dark and depressing at times, it is not without its comedic moments. I felt the ending was uplifting and very satisfying, and I warmly recommend this series.