D.C.II.S.S is a future story about Yoshiyuki, the new main protagonist of Da Capo. In the first episode, it was only a review to help us remember the characters of this anime. But we can tell that Yume is currently fall in love with Yoshiyuki and jealous if her sister, Otome, have fun together with him. Asakura Jun'ichi will be appeared again after 50 years as Yume and Otome's grandfather. Well, I think this anime will be a excellent choice to collect since the story isn't too hard to understand and the tsundere Yume is very cute. It would be the best if you watch it from thevery first series (Da Capo)