Rio Rukawa, a nurse, worked late at the hospital every day for her beloved younger sister, Minori. One day, her sister Minori gets into a car accident. Furthermore, by a cruel twist of fate, Rio is assigned as the nurse in charge of Nia, the victim of the accident. "If I sue, your sister's life will be ruined," she is threatened and becomes a puppet of a genuine lesbian. And the demands gradually escalate... Goodbye, happy days with my sister. A record of the hellish devoted service where the angel in white offers her body, is made to cum many times, and falls into a pleasure-obedient lesbian slave.