After getting caught up in an accident, Ryou Mihara is reincarnated in the world of Phi as a water magician. Waking up in a remote forest, he sets out to achieve his ideal slow life by living off monsters and refining his magic. Unbeknownst to Ryou, decades pass without him realizing due to his hidden trait, "Eternal Youth." One day, Ryou stumbles across a shipwrecked adventurer named Abel. As Abel requests Ryou to a...