D.C.II 〜ダ・カーポII〜
In episode 5 of "Da Capo II"'s first season (aired October 29, 2007), two main characters go to a movie called "Fuyu no Anata" (冬のアナタ), which is clearly "Fuyu no Sonata" (both share the same font and characters). One of the "Fuyu no Anata" posters visible in the "Da Capo" anime episode looks exactly like the first "Fuyu no Sonata" manga cover.