sorry, but i can only type in english right now, so i hope you will understand,
1) EGO : their games are mostly more towards the mystic side, and there are many myth, stories, and creatures that you will remember, though you might remember some of them. As for gameplay and story, its a bit better than all the other ones where you just press Ctrl and be done with the game, the love scenes are also pretty much the same over the course of the game, but there are quite alot of rape and tentical rapes in them, so if you are not into that genra, i suggest you stay away. (I personally hate it.)
2) CIRCUS : the game by CIRCUS is mostly about love stories with a bit of magical abilities within them, the most known game by CIRCUS is D.C. which is now remaked into an anime, their stories follow a path which is regonizable, but adding new element to the story, you can go check them out. For love/romance is my type of game
3) elf : i'm terrible sorry, but im not really familiar with this company, as well as their games, so i can't really say much about this. :029:
4) 戲畫 : i found that games by Giga (戲畫) is very well done, as with all the elements of story, style of drawing, as well as VOs, (voice overs) Dual savoir is one of the best H-game i have paly to date, while insanely fun to play, its also great with different characters, stories, and different twists and endings that will keep you comming back~
5) Alicesoft : Another great company with the great games, with alicesoft, you can take out the h-element, and it will still have a very very enjoyable game, as for that, i highly recommend this if you are into play styles, though the stories are nothing out of the ordinary, you can still get a hold of the whole game. Very nice indeed. oh, and most of their games does not have VOs.
heres my 2cents, hope you understand it, thanks for reading~~