Sayonara Itsuka (2010)

Other name: サヨナライツカ , Goodbye, Someday , Saying Good-bye, Oneday , 사요나라 이츠카

Synopsis:

Yutaka is assigned to work in Bangkok before getting married to his fiancee. There he meets the attractive Toko and the two spend an unforgettable four months together. Just when Yutaka realizes that he has true feelings for Toko, she leaves him. 25 years later, however, they still cannot forget the time they spent together.