A man and a woman, colleagues from the company, end up sharing a room at an inn on a business trip due to a misunderstanding. While the man gets excited, the woman's big breasts slip out of her yukata without a bra on. The man gets even more excited and his erection won't go down. He thinks he won't be able to sleep... but when the woman notices his erection, she also gets very excited. Thanks to the misunderstanding, he ends up getting screwed.