Mother - Sachiko (pseudonym, 48 years old), son - Ko (pseudonym, 22 years old). Within the intense events triggered by her own son, the strict and refined mother transforms into a lustful woman, her shameful and humiliating downfall depicted in vivid detail. As the elegant mother is dominated by her son, she is driven by uncontrollable love and desire, gradually breaking down in a deeply realistic portrayal. In PART 4, a new declaration from the mother about her happiness is recorded, adding further depth to the story.