Mangaka : Inokuma Shinobu
A school to teach teenagers how to pleasure society. That's what the School of Water Business is. Of course, the pleasure would be performed within water businesses. What's a water business? Just think of it like a place you'd go to to get a massage, and any part of the body you wish... And your masseuse could use any part of their body they wished... And they just happened to be girls... Well, you get the idea. As you might have guessed, this manga is not for little kids.
(This isn't Hentai, it's just there are some adult related themes and I would have to consider this to be PG-13 or a little higher.)
This manga review was taken from here