Ryou's optimism isn't naive, it's armor. The show knows the difference between a protagonist who laughs because he's stupid and one who laughs because he's already decided the world won't crush him, and it builds everything around that choice. The early episodes move with genuine leisure, letting you breathe alongside him as he explores, before the monsters and the weight settle in. By the time the animation starts falling apart in the final stretch, you've already stopped caring about the spectacle; you're watching because you need to know if this man survives being exactly who he is. The pacing will lose you if you want momentum. Stay if you want to understand why someone can be afraid and optimistic at the same time.

Ryou Mihara dies in an accident and is reborn in the fantasy world of Phi as a water magician, hoping for a quiet, slow life spent honing his new magic. Instead he wakes in a remote forest full of dangerous monsters and must fight to survive, living off the creatures he defeats. He is optimistic and clever, and without knowing it he carries the hidden trait Eternal Youth. Twenty years slip by, and every battle brings him nearer the height of human magic. Then he finds Abel, a shipwrecked adventurer who asks Ryou to travel with him through monster-filled mountains to the town of Lune, and a far larger adventure begins.