Tokubetsu Shinsatsushitsu

Megumi Nishino is summoned to the school by the new middle-aged doctor who has suddenly arrived and is told that she is suspected of having a disease. Despite her reluctance, Megumi feels so good that she accepts the school doctor's lewd touch. She traps Megumi together with Shiori, her senior, and Mio, her roommate, in the school using aphrodisiacs. What is the school doctor planning?