Michio Kaga, a young man dissatisfied with his mundane life, finds himself transported to a fantasy world after interacting with a mysterious website. This new world operates under RPG-like mechanics, complete with levels, skills, and labyrinths filled with monsters and treasures. Michio quickly adapts to the system, leveraging his knowledge of gaming mechanics to survive and thrive. He discovers that the world allows him to purchase slaves, a morally contentious practice that becomes central to his journey.

Michio acquires Roxanne, a wolf-human hybrid, as his first slave. Despite the initial transactional nature of their relationship, Roxanne proves to be fiercely loyal and skilled in combat, becoming an indispensable companion. Together, they delve into the labyrinth, battling monsters, gathering resources, and leveling up. Michio’s pragmatic approach to survival leads him to expand his group, purchasing additional slaves to form a harem. Each member brings unique abilities and personalities, contributing to the group’s dynamic and effectiveness in navigating the labyrinth’s challenges.

The narrative explores Michio’s interactions with his companions, blending elements of action, strategy, and interpersonal relationships. The harem dynamic is a recurring theme, with Michio balancing his role as a leader and protector while fostering emotional connections with his companions. The labyrinth itself serves as both a physical and metaphorical obstacle, requiring careful planning and teamwork to overcome its increasingly difficult levels.

As Michio and his group progress, they encounter other adventurers, merchants, and factions within the world, adding layers of political and social complexity. The series delves into the ethical implications of slavery and power dynamics, though it often prioritizes the practicalities of survival in a harsh, game-like environment. Michio’s journey is marked by his growth as a strategist and leader, as well as his evolving relationships with his companions, who gradually transition from mere assets to valued partners.

The story maintains a focus on the mechanics of the fantasy world, with detailed explanations of skills, item crafting, and dungeon exploration. This emphasis on world-building and system-based progression appeals to fans of RPGs and isekai narratives. While the harem element is prominent, it is intertwined with the broader narrative of survival and exploration, creating a balance between character-driven moments and action-oriented sequences.