Da Capo II
D.C.II ~ダ・カーポII~
Takes place approximately 50 years after the original D.C. ~Da Capo~ series.
The story revolves around Sakurai Yoshiyuki and Otome & Yume, the two granddaughters of the original D.C. ~Da Capo~ protagonists Junichi and Nemu.
(Source: MangaUpdates)