When it comes to hentai, story is not important at all, at least for me.
Only things matters are the girls and the sex scenes, and this anime did it right.
The girls look cute. Their voluptuous body drawn magnificently with great details.
The sex scenes are nothing you've never seen before, but they are improved by erotic kissing, licking and sucking. I like seeing how their breasts move with every pounding, and how their cheeks become sunken while sucking. The animation is absolutely among the best.
Well this one is one of my favorites. I'll watch this again in a while.