Sanae Kobashi is a mother living with her son, who suffers from chronic illness, and a husband who constantly comes home late from work. By day, she manages household chores and cares for her ailing son; by night, she endures loneliness and secretly satisfies her own desires. One fateful day at the hospital, she faces her worst nightmare—the doctor informs her that her son has only a short time left to live. Having suffered from illness since childhood, her son has never experienced romance or the simple joys of dating and playing with girls. What final gift can she offer him before his life ends? Torn between a mother's love and inner conflict, she is forced to make an agonizing decision.