Peters AV star Misaki no Manatsu, known for her beautiful features and toned slender figure, always greets the camera with a bright, cheerful smile. But in a stark white room, standing before a microphone, her expression is completely different—tense, almost unrecognizable. Stripped of all performance, acting, and artificial direction, she faces the harsh demand of pure, unfiltered sex. Fully aware of what's at stake, she takes on the challenge in one take, with no script and no acting. 'THE F1RST SEX' marks the beginning of Misaki no Manatsu's journey from AV actress back to simply being a woman.