Can male and female friendship really be maintained through reason alone? This special project puts that theory to the test—with a 1 million yen prize on the line, all eyes are on how their relationship will evolve. Packed with highlights, the experiment begins with playful banter showing mutual dislike. The girl instantly gets turned on from just a kiss, while the guy embarrassingly gets a hard-on at the sight of her bare penis—creating instant comedy. Since things heat up too quickly, they agree to continue the test under the rule: "Remove one piece of clothing each time." Though pretending to resist, the girl lets him grope her breasts, warning, "You mustn't get hard!"—yet the moment they kiss again, he instantly erects. Unwilling to give up the dream of winning the prize, they remove another layer and carry on. After a three-minute mutual masturbation session, the girl climaxes. Then, right after shouting, "Don't look at me!!", she squirts and orgasms again! The guy is left utterly stunned. Both have clearly lost control—penalty punishment confirmed. Now, she must keep pleasuring him until his penis goes soft. Though pretending reluctance, the girl enthusiastically continues while the guy remains slightly hesitant. At this point, they might as well enjoy it! She takes the lead, teasing him with an erotic blowjob while playing with his groin, her arousal intensifying the scene. Unable to hold back, the guy mounts her, mounting his bare penis in cowgirl position. She sinks down completely to the base, whispering, "Our little secret!" as she starts rocking her hips. "Feels so good! Ah, right there! Dangerous!"—she repeatedly climaxes. "Can I cum inside? I can't hold it!" he pleads, to which she joyfully replies, "Yes!"—receiving his sperm deep in her pussy. Still unsatisfied, the guy switches to rear-mounted cowgirl, thrusting hard and making her orgasm repeatedly. "Can I come again? Yes, go ahead!"—she catches his second load deep inside. "Still so hard!" they say, switching to missionary. Driven wild by his intense thrusting—"It's too much! I'm coming again! I'm cumming!"—she's overwhelmed as he maintains his rhythm, filling her with a third creampie. Even after stepping out of the shower, he's still rock hard. He takes her from behind in standing doggy, making her moan in disbelief as she receives yet another creampie. "Amazing! You can cum so many times!" she says excitedly. As they kiss, she gives him a handjob, triggering another immediate cumshot. Still not stopping, she continues jerking him off when suddenly he erupts with a massive cumshot—shooting semen everywhere. Ecstatic, she keeps going, milking out huge streams of cumshot without letting up.