After the mother's death, the Emioto household became a single-parent family with just father and daughter. The father worked hard to support his daughter Aya, and she grew up earnestly, inspired by his dedication. However, deep within Aya's heart, feelings for her father had gradually grown beyond mere familial love. Unable to suppress her emotions, she found release through nightly masturbation. Then one night, her world shattered when her father announced he was remarrying. The lust buried within her finally erupted. What Aya chose was to confront the forbidden feelings she had long hidden and face them honestly.