A 45-year-old office worker Yasuo Saiki, depressed after his wife leaves him, is approached one night by a beautiful girl from the prestigious all-girls school St. Marian Academy who offers him sex for money. He accepts and discovers the thrill of paying for sex with high school girls, leading to intense encounters involving deepthroat, paizuri with massive tits, raw pounding missionary and doggystyle until overflowing creampies, turning him into a regular client in the school's secret prostitution ring