Twelve years ago, Yoshie divorced her husband and raised her son, Hiroaki, alone. He has now successfully graduated from industrial high school and works busily every day at an auto repair shop. Worried about him, Yoshie longs to confess her true feelings during a long-awaited holiday trip he invited her on—feelings she's harbored for years, not as a mother, but as a woman deeply in love with him. This journey carries the warmth of a mother and son's bond, soon to cross forbidden lines.