Small and delicate, the sister is a working nurse in a surgical ward. Her younger brother strongly desires to be hospitalized at her hospital just so he can have sex with her. The hospital employs various nurses, and in the changing room, he secretly watches numerous nurses undress, fully enjoying the sight of his sister's beautiful breasts. Patients share rooms with other girls, and through the curtain, he catches sight of a girl masturbating, captivating his attention. An older, kind and caring senior nurse who looks after his sister appears and begins tempting the brother. During mealtime, she performs mouth-to-mouth feeding and tormenting play using a urine bottle. Eventually, the situation leads to sex. To fulfill his dream of sleeping with his sister, the brother endures various temptations and ultimately builds a relationship with her.