Yamamoto came to stay at a friend's house and was captivated by the beauty of his friend's mother, Reiko. That night, Yamamoto learned that Reiko was going to take a bath and couldn't contain his excitement. Driven by impulse, he thought he might be able to see Reiko's naked body and decided to peek into the bathroom... only to find Reiko pleasuring herself. Yamamoto recorded the entire scene with his phone and then used the photos to assault Reiko.
