Tall, glamorous Kayama Mio writhes in the intense high-leg pleasure that penetrates her crotch! One day, Mio, a female teacher who works at a private school, suffers an injury to a student of the chairman's son and the ace of the swimming club. He was then called by the chairman and handed him a leotard to take care of the swimming club until his son recovered from his injury. Mio can't refuse and changes into a tiny swimsuit, but she can't hide her pitiful side and ate her hard inside her crotch, and her body gradually becomes obscenely groggled...