Cherry Blossom ~Saigo no Sakura ga Chiru Maeni~

This is the story of Hibiki – a girl who turned to live like a social recluse, after she failed in the university she had applied (yet her friend DID).

Many years later as a steady OL, she reminisces on the period of time when she met the person who had changed her life (and helped her reconcile with said friend).

[taken from Koorin's blog]