Saaya, a 30-year-old woman who was in a serious relationship and looking to get married, until she was suddenly dumped by her boyfriend. Her life fell apart and, heartbroken, she returned to her parents' house. There, she met up with Haruta, a young man from her old neighborhood and who was almost a decade younger than her. Haruta, who had grown into an attractive man, still remembered a promise they had made as children: "When we grow up, let's get married."

Thus begins an exciting love story between Saaya, a woman in her early thirties who feels lost in life, and Haruta, a passionate young man who adores her.