Have you ever wanted to keep something that was special to you so much you would do what seemed to be an impossible feat to achieve it? What if that something special was just a place to masturbate at school? The main protagonist of this story is a bit of a unique character. He's a delinquent who somehow manages to not be expelled from school even after being found out masturbating nor does he even care about being discovered. But in order for him to continue to have his "Idol Research" club (his place to jerk off), he decides along with the student council that
he has to create idols and impress everyone at the cultural festival with them.
Of course, being a hentai and with such a perverted protagonist, the story includes plenty of sex alongside the idol training. The artwork is very good with good female designs though some girls do tend to look similar to others. It is a harem, though not right from the start and the manga eventually expands from more vanilla sex scenes to larger scale less-vanilla ones, though it's certainly not a dark or fetish-heavy hentai.
Aibuka is an enjoyable hentai manga that I would recommend. It does tend to be a little too story heavy at times (Chapter 5 especially given that there's only even nudity for the last couple pages), but it has plenty of good sex to go along with it. The artwork is great and the characters are entertaining, especially the balls-y protagonist. There's not too many fetishes in this, but if you enjoy idol stuff at all then this should please you as you probably already guessed from reading the simple plot description.