The fourth installment of the series has finally arrived. A schoolgirl with a pure and innocent appearance is subjected to the inescapable punishment of helpless, spread-leg urination. No matter how hard she resists, she's forced to endure three rounds of enema fluid—and simply can't hold it in. Screaming repeatedly, "My stomach hurts!!", she eventually crosses her limit and gives in to involuntary urination. The striking contrast between the girl's innocent demeanor and the harshness of her punishment is the main attraction.