Nanaho, a married woman and teacher at a prestigious school, takes on the role of supporting Smith, a Black English teacher who came to Japan to improve English education. She records his classes and shares the footage with me, her husband. One day, I find a DVD containing footage of Smith's lesson and, out of curiosity, I play it. At first, I see Smith nervously conducting his class—a somewhat endearing sight. But suddenly, the video glitches, revealing an unbelievable scene: Nanaho and Smith together in an intimate act.