HEZ-821 - Nurse Mizukawa Mizuna, after 10 consecutive night shifts reaching the limits of physical and mental endurance, was overwhelmed by sexual desire, becoming a 'sexual desire zombie'.

My older sister is my pride. She was an excellent student in school, capable, honest, and an ideal woman admired by other women. One day, she readily accepted an unreasonable shift and before she knew it, she was working 10 consecutive night shifts! Naturally, both her mind and body were exhausted, and her reason began to be overwhelmed by sexual desire... While drinking alcohol to comfort herself, a 'sexual desire switch' was activated, and her reason was completely overwhelmed...