Mayumi Nakai, 40 years old. She got married at 18 due to an unplanned pregnancy, and this year marks 21 years since then. Back then, the idea of a shotgun wedding was still rare, and the child she once hesitated about bringing into the world has now grown into a fine, independent adult. Reflecting on this milestone, Mayumi finds herself looking back on her life. Even if her marriage was a product of youthful impulsiveness, she feels she has genuinely done her best through all the ups and downs. Hearing her child say, "Getting married as a teenager? No way!" brought tears to her eyes. For the first time in a long while, she realized she might still want to experience a little freedom, a little fun. Starting today, we'll do our best to help Mayumi reclaim her long-lost sexual springtime!