The first episode of "Sei Brunehilde Gakuen Shoujo Kishidan" introduces us to a secret society of schoolgirls who indulge in taboo pleasures. Led by a busty, experienced senior, they initiate a new member into the world of anal sex. The young girl's tight, virgin asshole is stretched and filled, her cries of pain turning to moans of pleasure as she learns to love the sensation. The animation is explicit, showing every inch of penetration and the girls' ecstasy as they indulge in their forbidden desires.