By dating sim, do you mean something resembling a stat-based game where you choose your schedule each day, and you need a certain amount of strength/athleticism to win ‘sporty’ girl etc.? Aside from something old like True Love, there aren’t really any aside from Secret Wives Club (I haven’t played it so I know very little about it).
Based on what you’ve said I think you might be interested in Crescendo - the game takes place over 5 days, and there are 6 winnable characters. Although you end up on a certain character’s path fairly early on in the game, there are a few short branches within each path, and there are good and bad endings for each character(s). The story is very good and the characters are likeable, and for me it would be in the top 3 games that Peach Princess/G-Collections has released so far (the other two are Kana and Yume Miru Kusuri). However, if you’re looking for actual gameplay rather than some control over the story, then you’ll probably be disappointed by that (90% of the eroges available in English fall into this category though).
There are only a couple of releases with actual gameplay (ie. not selecting your response from a menu) like Pretty Soldier Wars, Lightning Warrior Raidy and Brave Soul. I haven’t played Brave Soul (which by general consensus seems to be the best of the three), but the other two are certainly very very light on plot, and I didn’t particularly like either of them. There’s also Utawarerumono which has been fan-translated by Mirrormoon, which has significant gameplay and story elements, but it’s a completely linear story, so in that respect you don’t have any control over what happens.