Tenma Otori’s life ends abruptly at age 25, but his journey is far from over. He wakes up at his own funeral to find a God offering him a deal: reincarnate into a dying fantasy world to help stabilize it, and in exchange, receive “cheat-level” magical abilities and physical stats. Tenma accepts and is reborn as an infant in the lush world of Merlin. He is adopted by a pair of retired S-Rank adventurers and a legendary wizard grandfather who raise him in the remote Kukuri Village. Under their strict but loving tutelage, Tenma’s overpowered nature quickly becomes apparent—not only can he cast high-level spells effortlessly, but he possesses a rare affinity for taming monsters, starting with a unique slime and a pack of divine wolves. However, his peaceful childhood is shattered when a mysterious organization targets his village, leading to a tragic confrontation that forces Tenma to leave home. Setting out as a solo adventurer, he travels from bustling trade cities to dangerous monster-infested dungeons. Along the way, he must navigate the envy of rival adventurers, the political schemes of royalty, and the growing responsibility of using his god-given powers to protect those who cannot protect themselves.