Due to a sudden transfer, Kenji moved up to Tokyo and stayed at his brother's house. His brother was away on business. Kenji discovered the footage from hidden cameras installed throughout the house. It captured his sister-in-law in embarrassing situations: enjoying a beautiful shower scene, the moment of urination caught by a camera inside the toilet, and the act of masturbating while digging into her vagina. His sister-in-law having sex with a man other than her husband.
