Years after marrying the owner of a data company, Haruka hears an infidelity complaint from Michiko, the wife of her husband’s employee. Michiko shows her pictures of hemp rope and BDSM gear with disgust, but Haruka finds herself captivated. She had secretly become curious about bondage after meeting the employee, Shinya, three months earlier. One morning, after seeing everyone off to work, she wraps herself in rope and masturbates alone—only for Shinya to return for something he forgot and catch her in the act...