Hina, a fourth-year university student, has come to the school as a teaching intern. She has no idea that a hopeless Mirai awaits her... The principal, who is also the special advisor for the Deep Throat Department, a specialized department that studies deep throat orgasms, has made Hina a teaching material for the department. Through the perverse deep throat learning plan that is repeated every day, she is stripped of even her human dignity, and reduced to a mere lump of flesh that can only be violated in the back of her throat... However, after enduring the twisted licking, Hina eventually experiences pleasure in the back of her throat that is even greater than the pleasure she experiences in the back of her vagina...