Kokoa, who transferred to an all-boys school, is so indifferent to sex that she unconsciously spreads her legs at any time. She doesn't realize that she is showing off her panties, and she questions the endless approaches of the men... But when she sees a rock-hard cock, she instinctively makes a wet stain on her panties, and accepts the cock, which is soaked from a blowjob, into her uterus. The screams that ring out throughout the school once again attract other men, and the inside of Kokoa's panties becomes wet every day...