Men pick up amateur girls with the challenge: if they can hold their pee for five minutes after drinking a powerful diuretic, they'll win 1 million yen. However, no girl can withstand the effects of the strong diuretic for five minutes. Overcome by embarrassment and panic, they all end up involuntarily urinating. Driven by shame and desperation, they submit completely to the men's demands, performing blowjobs, squirting, and having sex. The intense, erotic scenes unfold as the girls struggle with tension and humiliation.