[Once you are completely naked, have sex immediately! ? ] Have a face-off with your friends! The ultimate game where if you lose, you will be forced to take off your clothes or face a naughty punishment game! The one who gets completely naked first will be sentenced to a harsh punishment game. What will be the fate of the female college students caught up in this outrageous project...!? ? This time's challenger is the pair "Rina & Kana"! The two of them are like sisters and have a senior/junior relationship at university. The senior who cares for his younger sister is forced to take off his clothes first, but shows amazing persistence in the second half! What will be the outcome of the deadly struggle between these two people who endure in just one pair of pants?
