The Takakura family struggled financially to raise their only son, yet found deep happiness in their simple life. As their son grew older, the couple's relationship gradually weakened. Particularly Rina, who constantly battled intense sexual desires, resorting to nightly masturbation to satisfy herself. By the time her son graduated from university, her husband's infidelity was exposed, shattering their marriage and driving an irreversible wedge between them. Amidst the crumbling family bonds and broken trust, her son became Rina's sole emotional support. As familial and marital ties disintegrate, how will she navigate her overwhelming desires and loneliness?