The back of my throat is my erogenous zone... New trainee doctor Honoka has the utmost respect for ENT specialist Arai. However, he has a dark secret for his female subjects: he tortures their mouths until they reach orgasm deep in their throats, a practice he calls "deep throat orgasm research." One day, she witnesses this and is f** by Arai to become his subject. Enduring the deep throat t** every day in the name of research, Honoka eventually begins to feel even more pleasure in her throat than she ever experiences in her vagina.