Joi Minako: Watashi o bed ni tsuretette (1992)

Seiko entered the medical school of a certain famous private university without any problems, passed the national exam, completed a year of training at the university hospital, and now works at a clinic run by her senior colleague, Toda. Toda is also a lecturer at the university, so she substitutes for him on Mondays, Wednesdays, and Fridays.