Fukafuka Dungeon Kouryakuki: Ore no Isekai Tensei Boukentan

In a sprawling fantasy world, one colossal structure has defied the ambitions of every military force that dared to challenge it. Known as the Deepest, Most Unknowable Dungeon, this city-sized labyrinth remains an unconquered enigma, standing as a testament to the limits of mortal strength and strategy. For countless adventurers and armies alike, its depths have proven insurmountable, guarding secrets that no living soul has ever managed to claim. The story takes a dramatic turn when Jean, a young temporary worker who met his end on Earth, is unexpectedly reborn into this vibrant new realm. Rather than seeking a quiet second life, he finds himself captivated by the legendary dungeon that has thwarted generations of heroes. Driven by an unshakable fascination, he resolves to achieve what entire armies could not. Through rigorous training and meticulous preparation, Jean begins assembling a highly unconventional party of companions. By carefully selecting a group of lustful comrades-in-arms uniquely suited for the perilous journey ahead, he sets out to defy all odds. Together, this unlikely team ventures toward the impossible, aiming to conquer the ultimate labyrinth and carve their names into history as legends of a new world.