Tsukasa Nagano supervises a remote mountain construction site where there is endless work but employees keep quitting. The company puts her in charge of everything from recruitment to training. With few young workers willing to come, middle-aged men with complicated pasts become the main labor pool. There is no sightseeing or red-light district nearby, so Tsukasa brings back her wild side, rides the new recruits with nonstop rapid cowgirl thrusts, and keeps them ejaculating through seven straight shifts.