Yuriko lives a comfortable life as a company president's wife. However, her one regret is never having experienced romance during her school days. That changes when she meets a certain man, awakening long-dormant feelings deep within her. Dressing in her old school uniforms—sailor fuku, school swimsuits, and gym clothes—she mentally and physically reverts to her 17-year-old self. She discovers desires and pleasures she's never known before. Through these experiences, she becomes aware of her masochistic side for the first time, uncovering a whole new side of herself.