Ryo, an ordinary young man, is abruptly ripped from his everyday life and deposited into a fantasy world with no explanation. Upon arrival, he is granted a unique ability called the Vessel of Talent, a growth-type cheat that allows him to freely select and level any skill he wishes. Alongside this power, he receives a single, clear directive: head toward the labyrinth.

Guided by this implanted knowledge, Ryo sets out to investigate the massive, monster-filled dungeon that dominates this new world. With the Vessel of Talent, he begins acquiring a wide array of abilities at an astonishing rate, including scouting skills, three branches of magic known as reason, holy, and soul, one-handed weapon proficiency, and analytical skills like appraisal and discernment. What begins as a steady, horizontal progression of diverse talents soon proves to be far more powerful than expected, effectively turning him into an all-purpose cheat.

As Ryo descends deeper into the labyrinth, he battles monsters, unlocks new skills, and gradually pieces together the mystery of his sudden summoning. The central conflict is twofold: the immediate struggle for survival and growth within the dangerous dungeon, and the overarching quest to understand his own purpose in this world. The narrative follows Ryo's long journey from a bewildered newcomer to a formidable explorer, driven by the hope that the deepest floors of the labyrinth hold the answers he seeks.