Pretty good as an ecchi manga I would say, I really like this author's art style; female characters look gorgeous, with sparkly eyes and nicely drawn lips and the showing of pubic hair at times. The male characters also look very handsome in general and even other things like backgrounds and clothing aren't left out at all unlike what I've seen in many others ecchi manga.

The manga might feel kind of repetitive with a lot of it being the horny and somewhat rapey MC doing explicit sexual stuff with the female cast, so if you don't like the premise or the MC it might be a problem.

The plot progresses in a kind of expected way, with more and more female characters being added to the cast as various dramatic situations involving these new characters unfold and some character development with the MC occasionally showing a more serious and emotional side of him to try and keep his promise with the main girl.

But at the end of the day this manga is really about borderline-H scenes and comedy revolving around the MC being an unredeemable pervert and his unusual life.

Note that there is a 10th volume which contains alternative endings, all volumes except 10 presently have semi-color versions and the ultimate sex scene of volume 9 has an R-18 version on Fanza.