[NHDT-194]

Intestine Ability Research Institute Who's the JAV actress in this video? Amateur? Name revealed!

A unique work documenting experiments based on Professor Anaru Yamada's original theory interpreting the human body as a single tube connecting mouth to anus. Three subjects undergo various rectal stimulation experiments, including liquid enemas, foreign object insertion, and anal fisting, all fully captured on video. The film focuses on the intensity of stimulation and differences in physical responses, challenging the limits of the body's deepest capabilities.