Clannad, Amagami SS Recommendations
You Always Get The Feeling What If He Would Be With Her Or Her. Both Stories Has Different Stories In Them. By Clannad I Counted The OVAs As Well.
Both have a similar vibe in that it involves 1 guy dealing with 5 girls, each having their own arc and story.
Essentially, the plot elements and theme are similar.
-Both animes's setting/story goes by an omnibus format, and have small arcs that can either or not be diverging from the central plot of the story (with the setting intact)
-Both can be considered BUT IS. NOT. a harem, since the anime concentrates on one heroine to the next.
Basically the same school setting; Clannad contains MUCH more Drama than Amagami SS; There is huge affection to the main protagonist from all females in both Series.