Mayumi visits her daughter's home hoping to resolve marital troubles, but finds herself caught in an unexpected situation. The cause of the couple's argument is the son-in-law's intense feelings for her. As the discussion drags on late into the night without resolution, Mayumi decides to stay overnight. That evening, the son-in-law sneaks into her bed. Though confused and attempting resistance, she finds herself unable to withstand the intense stimulation. Her warm, mature body is enveloped by his, drawing her emotionally into an irresistible entanglement.