During a rest stop at a drive-in, female truck drivers are lured into a temporary massage room with an offer of "free massage." Hasegawa, a 32-year-old with seven years of driving experience, boasts a voluptuous, shapely backside that evokes an irresistible urge to bury one's face in it. Meanwhile, Iida, a 24-year-old with two years on the road, handles heavy cargo regularly, giving her a firm, well-toned bust. The young woman quickly succumbs to the pleasures of sensual massage, overwhelmed by intense sensations she can no longer suppress.