Sae Miyajima is a prim and proper nurse who outwardly plays the role of a serious, kind-hearted woman, but in truth, she's a bold and passionate woman with deeply hidden desires. She has an impulsive sexual nature, often engaging in quick, spontaneous sex with men she's picked up at bars, even having sex with them in restrooms. When hospital director Saito proposes marriage, Sae is thrown into turmoil after a cardiac patient dies of an attack while caught in the act of having sex inside the hospital—fearing her true nature will be exposed. However, Saito himself is entangled in a complicated romantic web, secretly relying on men she's picked up to introduce him to women for casual affairs.