Kokoa, who transferred to an all-boys school, is so oblivious to sex that she unconsciously spreads her legs at any time. Without realizing she's showing off her panties, she wonders about the endless approaches from the boys... Even so, when shown a rock-hard erect dick, she instinctively makes a wet stain on her panties and accepts the soaking wet dick into her uterus with fellatio. The screams echoing throughout the school attract other boys again, and the depths of Kokoa's panties remain wet every day...