A popular swimming instructor at a fitness club in Tokyo, married woman Miya Mizuse, makes her AV debut. Known for her motherly smile and kind demeanor towards students and parents alike, she secretly craves sexual pleasure beyond her husband. Unable to satisfy herself solely through intercourse, she indulges in daily masturbation sessions. Her first extramarital affair leads her to experience the intense pleasures of unfamiliar cocks, leaving her completely satisfied. Note that recording contents may vary depending on distribution method.