A complex project unfolds, observing in real time through heart rate monitors just how much embarrassment and shame the act of watching oneself defecate in a mirror can evoke. But an even more surprising twist is added—the mirror is actually a one-way mirror, with a hidden camera on the other side, a fact the girls are completely unaware of. Sitting astride a custom-built toilet seat, they squat down, exposing their genitals as their vulgar defecation is clearly reflected in the mirror in front of them. Their every expression and movement is vividly captured, with their emotions revealed through fluctuations in heart rate. Viewers can observe the shift from shame to arousal and pleasure, with glimpses of self-love and narcissism emerging. The mirror acts as a window into their complex inner emotions, laying bare their psyche. Buttocks, faces, genitals, feces—everything comes together in one intense scene, creating an extremely practical and deeply shocking visual experience for viewers. Mitsuki, with her lovely smile, undergoes an enema and bravely attempts defecation twice. Her round, perfectly shaped buttocks drip with filthy feces, and the container is piled high with a massive heap of nasty shit. Cool-headed Kana maintains her composure, but the heart rate monitor faithfully reveals her inner emotions. During defecation, she releases a barrage of loud farts, whispering, "This is so embarrassing…" Shy Nahomi squeals in a delicate voice, embarrassed, yet from her rear bursts out several tightly packed fecal chunks. Her excitement at being watched is palpable. Sana is a graceful, stunning beauty, but the impacted feces she expels are absolutely vicious—extremely thick, abnormally long, and packed with undigested matter, delivering a must-see spectacle. (Haisetsuya) ※ Facial exposure in main feature