The word sim, to me, implies a simulation that uses stats and/or managment…
A game can be a love story with the goal of winning a girl and still not be a Ren’ai game… ren’ai, based on my understanding, implies a game with HEAVY amounts of romance and very little sex… with the definitin of "if it’s a love story and the goal is to win the girl of your choice " … you could imply anything from Gibo to Horny Bunnies to Crescendo to Casual Romance Club as being a love sim… the truth is the only one that comes closes to being a love sim would be Casual Romance Club, despite the fact all of them focus on “getting a girl”… and I’m still not sure that even if we call it a love sim if it could be classified as a Ren’ai game…
Classification is very difficult. … we here in the West tend to simplify things … but nothing is usually black and white rather things tend to fall along all areas of grey(gray).
At one time I had written an article for a site on the different classifications … but I never finished it. Perhaps someday I’ll go back and see if I can locate the word file and redo it… I do suggest the links given above as well, for they do a good job at trying to sort out things which is, for most of us, (in my opinion) an almost impossible task. What I may call a love sim someone else may say “nah, that’s not a love sim it’s a ______”.
I liked the WC3 analogy. It made sense to me … let me attempt to add another.
All games that involve fighting may be considered action games, but the degree of fighting and the way in which it is portrayed may have a great impact on its final classification. I.E. A fighter pilot simulation is certainly not the same type of game as a 1st person RPG … yet both involve fighting and could be considered action oriented games.
In the same way, most all games sold through PP involve ultimately trying to end up with a girl, but that doesn’t mean they are all love sims or ren’ai’s for that matter… they would break down to a further classification based on the story content, character development, how the game is played (is it a visual novel? does it have stats? do you move around from location to location? is there only one ending or is there more than one? Is it about raising a child? Is it about training a slave (or maid)? Does it involve a serious romance? Is it a tear jerker? etc…etc…) and so on.