Satomi says she can cum while masturbating but rarely reaches orgasm during sex. Her solo play confirms that she has no trouble getting herself off, so the production brings in a veteran porn actor to test whether intercourse is really the problem. If even his technique cannot make her cum, she wins a prize. The challenge starts, but she immediately begins moaning with pleasure—and then cums not once, but repeatedly. It seems her previous partners simply lacked skill. She misses out on the planned prize, but the powerful orgasms turn out to be an even better reward.