I'd recommend Eiyuu Senki GOLD. The story is basically non-existant (I could even give you a short rundown if you're interested) so you're not missing much there. There are a lot of short missions for interacting with the characters, but except a select few of them, they have nothing to do with the story.

Other than that, it's just a Sengoku Rance-like conquest RPG.

Edit: Looking at the VNDB page, there's even an English interface patch. Should make it a lot easier for you.