What happened to the sister bound by such a strong bond? The Young Mama Trucker hits the Dekotora highway once again!

Kei keeps her truck rolling day after day, always thinking of her young daughter, Iku, who lives apart from her. Kei’s protégé, Maako, also drives a truck to pay her little sister Mio’s school fees. One day, Kei spots Mio taking money from a middle-aged man. Not long after, word comes that Maako has quit her job…