Nanaho, a female teacher, is living happily with her upcoming marriage to Kazuo, a teacher at the same school, in three months. One day, she was having sex with Kazuo, who said he wanted to have sex blindfolded, but it turned out to be the lowlife dick of a delinquent student that made him climax. He was threatened with compensated dating, so he offered Nanaho to the delinquents, and their lovemaking suddenly took a turn and he was sent into creampie gangbang hell... Toyed with in a gangbang game called a dick guessing game, Nanaho, who has a sensitive body, climaxes repeatedly even though she doesn't want to, and eventually her reason breaks down...