I've played Rance I , II, III, VI(Sengoku) until now, but I wanted a change of peace, some different characters/genre. Sadly, for the other games, I can't read Japanese so that's kind of... you know . Since the protagonist usually doesn't talk and there's a lot of text without voice, I'm going to miss a lot of the plot.
Hehe, I placed it really high on my "what to play next" list.
Sengoku Rance > Koihime Musou. While the character development in Koihime Musou is richer, but it's downfall would be the battle system, your enemy will do the same thing, again and again which makes it really easy and boring from a point. Also, the story in KM is linear, the same events are going to happen no matter which characters you develop your affection with, of course it's different at the last event depending on the 3 main ones. I enjoyed both Koihime Musou and Sengoku Rance, but I still have to finish the Isoroku Route on Sengoku Rance and I still enjoy the game at it's fullest.
I got Yumina yesterday night and I've played it for 2-3h already, it's enjoyable. I did't mind the grinding in Kamidori, I don't think I will mind it here either but.. it gets really annoying in battles when they have the same dialogues when you use a skill.
I will add the games to my list, thanks a lot!