Final chapters already? Awww.
That said, I kinda understand. While the concept is amusing and the characters are good looking, the series never went full on with the fanservice nor the comedy. It needed to be more over the top in both fronts to be long lasting, unfortunately it didn't quite reach the potential it had.
Reminds me of Saki-chan wa Inma no Ko, that also had a fanservicey premise but failed to go all out on both the comedy and the fanservice, so it ended up half assed in both fronts. These types of mangas need to go all out on their premises or they fail to garner much interest.