I was hesitant about starting down this series with it's label of an ecchi tag. However, this series is pretty good. In all honesty, it would probably turn off many, and draw in others. It's full of typical Japanese ecchi humor, which isn't bad if you're not a prude, a bit of a harem theme going but not in your face about it, and an overall feel-good story. It borders on sci-fi and fantasy, although that part of the story isn't fully explained. The focus of the series seems to be on the characters' interactions with the main character. There doesn't seem to be much background plot or direction to the story beyond these interactions. One thing I didn't like was that these interactions became a bit repetitive with each subsequent addition of a new character. The series only has 2 seasons, so it didn't get too drawn out like how extremely long series sometimes constantly reuse the same formula.
I would recommend this series if you want some laughs and aren't looking for something serious. You would like it even more, if you are into fan service, or are male. If you hate harem and ecchi themes, then you may want to avoid it. The series seemed to be made just for me, so I am giving it 9 stars.