Morikawa Kasumi is a poised 26-year-old wife and trained pianist with more than a decade of experience. Her young husband has a cuckold fantasy and makes her play piano braless, without panties or fully nude, filming the performances and uploading them online. As she indulges his fetish, Kasumi awakens to the thrill of being watched. Their desires escalate until she applies to appear in porn, revealing her bare breasts and publicly sharing sex for the first time.