It was an enjoyable show, however it is hard to give it high marks objectively. After seeing the first 5 minutes I thought this show stemmed from an adult visual novel. That is not necessarily a bad thing, Fate Stay Night and Utawarerumono stemmed from adult visual novels. This show stems from a manga.
It is a standard harem show. Like most harem shows initial plot device that brings everyone together is trivial. The characters have some good potential and grow throughout the show. Even though they are close sisters, each girl has a very different personality. There is: The Natural. The Introvert. The Sadistic. The Energetic. The Cool. As with many harem shows the goal is to get the viewer to choose the bride. Not as fan-service based.
The animation and sound are average.