A disturbing and intricate setup unfolds as the girls defecate while watching themselves in a mirror, their shame and emotions measured through heart rate. Unbeknownst to them, the mirror is a one-way glass with a camera on the other side, secretly recording their every move. Straddling a custom-built toilet seat, they squat bare-assed in front of the mirror, exposing their genitals and revealing their vulgar postures. Their expressions and physical reactions are closely tied to fluctuating heart rates, capturing raw emotional states. What do they feel as they shit? Does humiliation turn into arousal? Does self-obsession or narcissism emerge? The mirror reflects the complex hearts of young women. Anus, face, genitals, feces—everything comes together in intensely realistic, practical imagery. [Teruko] A laid-back older sister type. Smoothly expels healthy, firm stools, followed by splattering soft ones. The resulting feces have a perfect two-layer structure. [Rei] Heart rate exceeds 170 from sheer tension. Releases gas, liquid, and solid waste without restraint, producing a striking, splattering "bubyaa" sound. [Haruka] A cool, bespectacled older sister with an intellectual aura. Contrary to her composed look, she blasts out filthy, squelching sounds from her ass, straining out thick, slimy shit. [Aoi] At first, only a small amount emerges—seeming like a failed attempt—then suddenly, as if a dam burst, a massive load gushes out all at once. She acts as if showing embarrassment means defeat. A work by Haishitsu-ya. ※ Faces fully shown in main video.