there's only 1 part of dragon knight that was translated..which was xentar...and it was was back in MSDOS era
Kamidori,Sengoku Rance,Utawarerumono were part of better RPG&EROGE but Eien no Aselia were the all ages version
you can try some others too like DaiBanchou,Minna Daisuki Kozukuri Banchou and Kaiki! Drill Otoko no Kyoufu
but if you were just looking for cgs and something to enjoy along the way..
get Raidy series and Monster Girl Quest series
both were pretty much decent but enjoyable though~
if you were into the great old school art..try Castle Fantasia Renewal 2