Can men and women really stay just friends? College students approached on the street join a simple test: spend the night alone together on a love-hotel bed. They earn ¥50,000 if nothing happens, ¥500,000 if they have sex, and another ¥100,000 for every extra round—but they get only one condom. Senior-and-junior pairs, classmates, and even students who already have partners are shut in together while horny. In the end, every pair gives in to money and lust, fucking repeatedly and having creampie sex behind their partners’ backs.