Until recently, her father-in-law was energetic at both work and play, but due to an injury he has aged considerably. Tsubasa, a young wife, is worried about her father-in-law's condition. One day, her father-in-law tells her that he has been feeling down due to erectile dysfunction, but seeing her naked has aroused him for the first time in a Tsubasa time. Tsubasa is torn between wanting to help her father-in-law and feeling guilty towards her husband. Her father-in-law's aggressive sexual approach to improve his erection is outrageous.