Mizu Zokusei no Mahou Tsukai Dai Ichi-bu: Chuuou Shokoku-hen

Ryou is reborn in the fictional world of Phi, believing he will spend his time learning to use water magic in peace. Instead, he quickly faces the harsh wilderness and dangerous creatures of a distant subcontinent. Despite these challenges, Ryou remains optimistic and resourceful, aided by his hidden "Eternal Youth" ability. Over twenty years, he grows stronger through constant battles, gradually reaching the peak of magical power. An unexpected encounter soon places him at the center of major events, altering his path. As he continues to develop his skills, Ryou remains unhurried, forging his own way toward becoming the most powerful water magician in the world.