Kanojotachi no Jidai (1999)

Original title: 彼女たちの時代

Fukami, a 26 year-old girl, has a uneventful life, working as a telephone operator. She finds her work tedious and wanted something more important aside from romance. She then meets two girls of the same age, Chizu and Tsugiko. They have something in common though their situations are different. And so, they all became close to each other. (asianwiki)