At a gal school festival with an average IQ of 35, the event transforms into an all-time high adult carnival. AIKA teams up with three fellow gals to run a booth, where the one who attracts the fewest customers must endure a creampie soap game punishment with the class's creepiest guy. Despite the strict rule forbidding actual sex, AIKA, desperate not to lose, secretly offers customers a full six-course adult experience—oral, massage, handjob, lingerie, roleplay, and soapland services—aggressively seducing them as a naughty gyaru. But when she starts sneaking in real intercourse behind everyone's back to gain an unfair advantage…