Fourth-year university student Mihina arrives at the school for her teaching practicum, unaware that her future has already been decided. She becomes a teaching tool for the school's principal, a special advisor to the specialized department of deep throat studies—"Iramachio Department." Day after day, she undergoes twisted deep-throat training, losing her human dignity and reduced to nothing more than a flesh object. Yet, enduring the perverse pleasure with a distorted smile, Mihina eventually discovers that the ecstasy she experiences in her throat surpasses any pleasure she has ever felt deep within her vagina.