Story
Very simple and predictable, often felt rushed. Actually, it's hard to even talk about story here.
Comedy parts were decent and ecchi scenes very good, even if sometimes they felt forced. Harem element was introduced properly, although some side characters had extremely small roles, wasting their potential.


Art
Solid. Characters looked pretty, facial emotions were cute and ecchi scenes... ecchi. Art was clean, with no clutter that'd make it hard to read. At the same time there was nothing that'd make it outstanding or unique.


Characters
Strongest point of this manga. Even though there wasn't enough development for them, all girls were really likable and cute. Characters weren't usual archetypes, each of them felt interesting and made me want to see them more.
Main weakness of this part is lack of flat-chested girls, as the only one that appeared didn't get much attention, and, previously mentioned, lack of development.


Enjoyment
Very enjoyable. Good art and characters are enough to make ecchi harem fun. I'll probably forget about this manga in few days, but I don't mind. It's short manga that doesn't require any deep thinking - perfect when you have 2 or so hours to waste and want to enjoy some cute comedy with good ecchi.