Dungeon Slave follows the journey of a teenager who, caught in the throes of an addiction, inadvertently finds themselves transported to a vibrant fantasy world. This new realm is home to three stunning female adventurers: Arla Rain, the formidable female holy knight; Shena, the deadly succubus; and Fiel Winberrl, the skilled elf archer. Tasked with assisting these enchanting characters, the teenager learns that they possess a unique power critical to overcoming the tyrannical demon king—this power is rooted in the magical full potion, a revered item capable of providing extraordinary strength and healing.

Throughout the game, players will engage in various missions, each randomly assigned by the guild master, to increase their adventurer rank. Adventuring through treacherous dungeons, players must battle fearsome enemies and formidable bosses while switching between characters strategically. Rest and recovery occur at inns where players partake in immersive "Hentai" activities, gradually restoring health points. With over 20 intimate scenes ranging from 3D graphics to Live2D animations, players can explore character-specific narratives and unlock new poses and abilities. Upgrade your characters using gold earned from completed quests and immerse yourself in a captivating blend of combat and adult-themed storytelling.