55-year-old Asami is in her 28th year of marriage and a mother of two. She originally worked at a government office for five years before transferring to the public relations department, fulfilling her dream of creating PR publications. She married her team leader there and left her job to become a full-time housewife after giving birth. After her second pregnancy, her sex life with her husband gradually faded into a sexless marriage. When she turned 50 and started part-time work, she witnessed a close acquaintance's affair, which deeply shocked her. Unable to suppress her growing curiosity, this mature married woman resolves to open the door to a new world. On a one-night trip with a man other than her husband, she repeatedly takes another man's cock deep into her vagina, writhing in pleasure—ushering in the beginning of a new life.