Tamao enters the "Girl-Gamble Challenge" to convince Miyanagi Sena, a famous erotic pinup idol, to join the school's "hame-dori" album. By correctly guessing her favorite professional works through a deep understanding of her philosophy, Tamao wins the bet and discovers that the provocative star is actually a virgin. While Tamao celebrates his victory, the student council VP hints that the next challenge will put his very life on the line.