秋月 茗子 (Akizuki Meiko, 秋月 茗子)

Miki's best female friend Meiko is the only child of wealthy parents and is very mature and beautiful. However, her family life is troubled because her parents are unfaithful to each other and constantly argue. She falls in love with Shinichi Namura after realizing that he has the maturity that she craves, but their relationship as teacher/student proves to be a huge hindrance.

Source: Wikipedia