A pair of coworkers on a company trip to a hot spring are asked to take on the project to see if they will end up having sex. The participants are hesitant about mixed bathing, but are attracted by the amount of the prize money. At first, the two complete simple missions such as holding hands, but then a secret mission is announced! Will they be able to get into the high-price missions, which include 50,000 yen for a kiss, 100,000 yen for a hand job, and a whopping 200,000 yen for sex?