One's Factory presents the long-awaited compilation of its popular series "Thick Old Man and Female Teacher"! Intelligent and beautiful female teachers, admired within the school, are gradually drawn into a secret relationship with a greasy older janitor. Forced to submit, they become mentally consumed by the pleasure, growing increasingly dependent on him. As they lose their dignity as educators and descend into darkness, this work delivers a series of intense, disturbing developments. Enjoy this dense, gripping tale where pleasure and guilt collide.