Utawarerumono - It's a visual novel/SRPG hybrid by Leaf. The gameplay is really fun, even if it's not deep, and if you feel like you're up to some challenge you should play it in Hard Mode 1 or 2. The game has a light narrative, so the text never gets dense and good for some light reading. I'm not a fan of SRPG, but this one is possibly the best I've ever played. Score: 9.5/10 Sengoku Rance - It's a great game. Score: 8.5/10
Dangan Ronpa Kibou no Gakuen to Zetsubou no Koukousei - It has a mini-game. This murder-mystery VN is also a good material for some light reading. Score: 7/10
Minna Daisuki Kozukuri Banchou - Basically, bumper car.
I've finished all four of them, so I can assure you that they're good.
Daibanchou -Big Bang Age- - Turn based strategy game. Heard that it was hard. Not sure. Eien no Aselia -The Spirit of Eternity Sword- - It's all-ages.
Tears to Tiara - Not as good as Utawarerumono.
Brave Soul
Marunomi
Desire Dungeon, Okasare Yuusha, Okasare Yuusha II, Raidy & Raidy 2. - It's like Monster Girl Quest, you got raped.