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Just a quick opinion here : when trying to learn the language, it might be better to avoid games with gameplay, as the tools to help you aren't best suited for gameplay parts. I don't know if the dating sim you have in mind should be in the 'have gameplay' category, but keep in mind that it might be easier for you to stay in the normal VN perimeter to learn JP.
As for your question in itself, sorry I know too little about dating sims and let someone else answer you.

This! 

Aselia and Seinarukana

Utawarerumono for the rpg stuff too.

interesting game play  is vague
littlewitch romanesque (raising sim), dungeons & dolls , other rances (dungeon crawlers), dungeon of lulu farea(a puzzle game, not a rpg), monster girls quest (since it's nscripter, but paradox doesn't count here because it's rpg maker)
 

theres the lightning warrior raidy games.

You pretty much have played of all them.

Play Symphonic Rain if you want to play the hardest rhythm game ever made.

+1 for Dal Segno. Had some tear-jerking moments (at least for me)
and some say it is too slow, but I enjoyed it nevertheless.
 
As for other school-romances, besides those posted by @littleshogun, you may also try Princess Evangile, Noble Works and KoiChoco. I liked them all too.

Strictly speaking, Fureraba is a lovely-dovely, icha-icha-heavy story all about a highschool guy and his GF with dating-sim elements and little else.
If you are looking for something similar to Fureraba, then fruit of grisaia is definitely not it (it's a very good VN though and well worth your time if you are looking for something different)
Frankly speaking, I don't think you can find anything like Fureraba if you can't read non-english VNs.
I think these 2 are some of your best bet (Wagamama is quite a bit heavier on moe than Fureraba. Take note if you don't like this). If you do try IMHHW (Kono Oozora), make sure you install the fan translation as it is miles better than the official Moenovel TL.
Clannad is a emotional tear-jerker story. It definitely does not have the same vibe as Fureraba and I'm not sure if it's what you are looking for.
Lastly, heed the fact that the original Da Capo is an extremely dated VN (not to mention it's extremely expensive when compared to modern VNs). It has severe flaws by today's standards (The route-leading choices are not even clearly indicated. I had to make my own list of which choices lead to which route in order for the VN to be playable). If you want to get into the D.C universe, read D.C 3 instead, or perhaps even Dal Segno, which I think you will like.

As for the recommendation, I can recommend you HatsuKoi, Saku Saku, Tsujidou, and Miagete. For Miagete, as long as you didn't mind with the H scenes is cut then it's fine. After that, maybe you can try Da Capo trilogy as well as ToHeart 2. Hope my recommendations will help you.

I havn't played Fureraba yet, but I'll list some of the ones I've played...
Grisaia is a great choice. Has quite a lot of comedy, sexual themes ...... and some strong emotional feels. Pretty unforgettable story, one way or another. If you enjoy it, you can check out the rest of the trilogy (and the Idol girl spinoff too).
Katawa Shoujo https://vndb.org/v945 . Many people read this as their first VN. The characters are pretty well written.
Kono Oozora https://vndb.org/v9093 . This is probably right up your alley. Quite light hearted, but still has some drama.
Clannad https://vndb.org/v4 . If you want a read with massive emotional feels, this would probably be it (or some other title by KEY). It's ..... really long though.
Nekopara series is all about adorably cute catgirls in comedic and lewd action (and even a few heartwarming moments). Each Vol is rather short.
Wagamama High Spec https://vndb.org/v17823 . Great art, cute music, manga and eroge references ..... and more sex then the usual eroge.
Symphonic Rain https://vndb.org/v38 . Consider this after you've read a few of the above suggestions, and are looking for something a bit different. The characters have surprising depth.