But... I guess that means there's no reason to play the first if the second has all the same animations, probably? Not that the first was a large game or anything...
Aside from the story this game is essentially just the first game with a new coat of paint. The only difference is that the first sex scene from the first game (a blowjob scene) was removed from this game, there are 2 new monsters, 1 new enemy type (well, 1 new enemy type the monsters can fuck), 2 new sex scenes, and the monsters and enemies can have different colors based on level. Everything else is the exact same as the first game, so yea if you don't care about the story (as little as there is) and the blowjob scene, there is genuinely no reason to play the first game.
