Tsuyoshi's mother, Shiho, was beautiful and admired by Tsuyoshi's friends. However, Shiho had a secret. In fact, she was having a physical relationship with Tsuyoshi's friend Akira, and they were having an affair hidden from her family. One day, Shiho invited Akira over to her house as usual, hiding from her family, and indulged in a moment of pleasure. She was unaware that the whole act was being captured on a secretly set up camera...