Deai Asagiri: Tabako no Nokoriga to Yoake no Kimi

After years together, your girlfriend Chisa Tsukiyama suddenly decides to leave to study overseas.
No argument or plea can change it -- only five final days remain.
During the final five days, you silently agree not to speak of the future, only the present, as if nothing is ending.
Every kiss, every claim on each other grows more intense than before.
And Chisa -- more yielding, more accepting -- offers herself to you without resistance.

[From DLsite English]