Mizu Zokusei no Mahoutsukai

Synopsis:
Ryo finds himself reborn in the magical realm of Phi, excited to embrace a peaceful existence mastering his water-based abilities. However, his expectations quickly wash away when he’s thrown into the untamed wilderness of a dangerous subcontinent teeming with monstrous threats. Despite the constant peril, his unshakable optimism, sharp wit, and the rare gift of eternal youth keep him afloat as he hones his skills through relentless battles.
Decades slip by unnoticed as Ryo grows into a formidable mage, his power inching toward legendary status. Yet his journey takes an unexpected turn when a single encounter propels him into the heart of a world-changing conflict. What began as a simple quest for knowledge transforms into an epic saga, shaping him into the most extraordinary water mage in history—one who still prefers to take life at his own leisurely speed.