In a bizarre room filled with medical equipment, examination tables, and restraints, men in surgical gowns conduct strange experiments. Another girl is brought into the laboratory, where sensitivity tests are performed using various devices such as mouth gags, speculums, and piston machines. Mouse-chan, barely conscious, offers slight resistance. Her uncontrollable drooling soils the room, earning her scoldings. The men record the experiment with cameras, clearly enjoying themselves. What kind of experiment is really taking place here? Perhaps they're acting on someone's orders. The darkness within this country runs too deep. For those aroused by such acts, this footage may provide a new kind of thrill. Once again, helpless Mouse-chan becomes the subject of their experiments.