@Glomoro
I just wrote CLANNAD because is one my favourite series and they even have a cute little daughter. I also don't know a lot of animes that have a lot of story after the Main couple start actually dating.
Here's my MyAnimeList: https://myanimelist.net/animelist/Dan_Shock
The ones I really like and have story the usual finish line are: Clannad, Bokura ga Ita, Byousoku 5 Centimeter, Eureka Seven (maybe, kind of :v), Fune wo amu, Genshiken, Golden Time (one of the best), Higashi no Eden (maybe), Kimi ga Nozomu Eien (I don't really remember very well, It was a long time ago), Kuzu no Honkai, Nagi no Asu kara, Nana, Nodame Cantabile, Onegai☆Teacher (maybe), Ore Monogatari!!, Rec, ReLIFE , Sakurada Reset (kind of), School Days (one of the best), Shinsekai yori, Shouwa Genroku Rakugo Shinjuu, Strawberry Panic, Wotaku ni Koi wa Muzukashii (maybe), Zero no Tsukaima