Yumi, a truck driver's wife who travels the country, is delivering goods for an acquaintance today. As she speeds along in her beloved truck, she discovers a stranger hiding in the back... The young man, who introduces himself as Shinji, says he ran away from home to find his long-lost mother. Yumi, who can't resist a good story, happily lets him ride along. Late at night, during a short break, Yumi takes a nap. Shinji, starved for maternal love, can't help but start groping her sleeping body...
