You've watched these girls for a total of 48 minutes already, making jokes about being nude and having sex.
Now watch them for the final 4 minutes as they Get nude and have sex.
Don't worry, it's not anywhere close to hentai, but you might want to listen to it using headphones.
My verdict: It's a nice finish and DVD exclusive special for a borderline hentai anime, but nothing special. I give it a 6 out of 10.
I enjoyed the brief minutes of crazy antics, but it was slightly cringeworthy.