[Namiroji (Shiina nami)] Haisetsu Shoujo 15

Kanade Shijo, a school beautification committee member plagued by irregular bowels, finally surrenders to a three-day bout of constipation the instant she reaches the school toilet, clutching her books as she announces she can't hold it any longer. Every strained, sweat-slicked push is rendered in loving close-up—her plump, round buttocks trembling as thick, heavy loads at last drop free, followed by the dazed relief of a girl who mutters that the hard part is only beginning. With no partner and no penetration, the appeal is pure solo observation: breathy gasps, quivering thighs, and the intimate, unglamorous ritual of a schoolgirl's most private battle.