probably not. they still have this brown haired, small girl and the other adult blonde chick. so there's still enough material for at least one more episode.
Not to burst bubbles, but it very well could end at episode 2. The game cg certainly didn't have a "harem" route, and this animation seemed to focus on Kisara (the dark-haired, blue-eyed girl) over everyone else. I'll admit leaving the Chairman out seemed like a cop-out (maybe because she looked like a loli?), but Reina I could probably understand, since she had just one scene in the game.
Honestly, I'm surprised this series wasn't as hardcore as the game. There was a lot more bondage, and the like.
Overall a great series; the sound effects, the animation, the voice acting, all top notch.