Inmon Tougi Toshi Sodom -Daikanshuu no Mae de Kyousei Jutaisaserareru Seisenki | 淫紋闘技都市ソドム ～大観衆の前で強制受胎させられる聖戦姫～

In a barren, sandy wasteland, there exists a city that has maintained its independence and autonomy for centuries, resisting the rule of any kingdom. Its name is Sodom. A place where the desires and pleasures of this world converge. In the city's center, a massive colosseum hosts public gladiatorial combat against monstrous creatures; defeat means death.

To purify this lawless city, Gloria, the "Iron Maiden," the renowned swordsman and Captain of the Royal Knights of the Ernades Holy Kingdom, and Pamela, the powerful holy magic user and "Holy Knight," head to Sodom. Their journey is a trial for royal succession; they aim to persuade Sodom's king to submit to the Holy Kingdom's rule. There, they encounter Anastasia, the "Black Dragon's [something]," a mysterious and beautiful woman imprisoned by Sodom's king, Gaspar. To purify Sodom and rescue her, Gloria and Pamela will fight in the colosseum's tournament, where victory grants any wish.

Though they should have won easily, Gaspar's treachery leaves them with a "lust mark" on their lower abdomens, derailing the undefeated warrior's destiny…