In a household of four, Sumika finds herself unfulfilled by her relationship with her husband alone and gradually forms a deep bond with her stepson. While striving to maintain her role as a mother, she can no longer suppress her desires and ends up revealing her true self to her son. Confused and overwhelmed by his mother's actions, the son struggles to process his emotions and withdraws into isolation. Amid this unstable family dynamic, a new event awaits.