Yumi married her current husband a year ago, and initially got along well with his children from a previous marriage. However, when she discovers he married her solely for her fortune, the sons' attitudes gradually turn cold and hostile. After this incident, Yumi is bound with a skipping rope, left immobilized and forced to endure daily humiliations. As the relationship between her husband and his sons shifts, Yumi's own psyche begins to twist and break. Trapped in this nightmare, what thoughts go through her mind as she struggles to survive this ordeal?