Certainly an interesting title. If it weren't for the cheating tag, I might have thought it was some kind of beach where all the girls there are the protagonist's wives.
Great ending though. So this is the difference between a Hentai Protagonist and his buddies...
A CHEATING SCENARIO IS NOT SUPPOSED TO LOOK THIS HOT!!!!! ... and Shizuka-san seems rather willing to continue this (*cough-cough*) arrangement. Katase-kun, you *&@#!$? Lucky Bastard (GRR)!