Nurse Kaori is exhausted once again after her night shift. Due to severe understaffing, she's always drained, and sometimes she lies down on an empty hospital bed in a deserted ward, dozing off without realizing it. An inpatient secretly watches her through a crack in the door, then quietly undresses the sleeping Kaori and begins teasing her body using medical tools. Half-awake and unaware, Kaori instinctively responds. As he probes her unsatisfied body with movements that mimic a medical examination, the tension builds into an intense, thrilling encounter.