Yuki Chiba, a 40-year-old office lady from Gunma Prefecture. She normally works in an office at a construction company, and after marrying her husband—her former classmate—she has spent over two decades balancing work and housewife duties. With her children now independent through employment and education, life has gradually settled down. Then one day, she found a chance to rediscover her sense of self and identity as a "woman." From that point on, she began to value herself more during her work breaks. She realized it had been a long time since she last had intimacy with her husband—ever since giving birth to their second child. Around this time, she met a younger man at work, and their growing relationship brought unexpected excitement into her life. Through their connection, she truly felt how much livelier each day could be with a man's presence. Experience the full allure of Yuki Chiba's explosive body and discover a new side of this married woman in her debut work.