I usually don't mind some harem aspects to manga/anime/light novels. But I'm getting a bit tired of it in this series -- probably because that's about the only thing it does. This particular book started out alright with finishing up the bit of story from the last book but then just devolved into a series of random fan service episodes that didn't take the story anywhere really.
I'm not in a rush to go out and find a copy of volume 6.