from Renta!:

"Hey, Chiaki... Are you interested in those kinds of parties?"
It didn't matter if it wasn't normal. He was just looking for a world that would get his blood pumping, but now that he's actually ended up there...

Chiaki is an editor at a fashion magazine. His boring existence suddenly changes when he gets an invite to a party from Rei, a model who enjoys a very different kind of life. Once there, he finds himself in the midst of a whole new world of pleasure-seeking! Among the men, he meets the kind-hearted Taiga... his life will only get crazier from here!"