Staying overnight at his friend Kitamoto's house, Kitamoto accidentally discovers Makiko Tsurukawa, Kitamoto's mother, masturbating. He secretly records the scene on his smartphone and successfully obtains the footage. Captivated by Makiko's beauty and driven by the urge to make her his own, Kitamoto boldly visits her room. Though he initially intends to blackmail her with the video, Makiko's unexpected reaction takes the situation in an unforeseen direction, leading to an intensely gripping encounter.