With a smile that goes straight to the heart and an irresistible closeness that makes an affair feel tempting, bright and charming married woman Yu Hironaka makes her porn debut at age 28. Popular since her school days, she married the boyfriend she dated back then and seemed to have everything she needed for a happy life. Yet as their marriage slipped into a rut, her smiles grew fewer by the day. Searching for a new kind of happiness, she now steps into the erotic world of porn.