Reborn in Another World, Raised by the Elven Queen

[One heroine + near-invincible protagonist + Western fantasy + travel]

Two hundred years after the evil god was banished, Lorne transmigrates into a young man and uses the power of purification to cure the elven queen's chronic illness, ending the Eternal Forest's two centuries of isolation. The fifteen-year-old seventh-tier Elemental Lord sets out on a journey with Eileen, the queen's personal guard, to explore the reborn continent of Athera. The arcane academy's magical industry, the Holy Light Church's fanaticism, the federation merchants' love of money... The postwar world is far livelier than he expected. Fun-loving Lorne says, "The world's so big. I'll find myself a wife first, then take my time exploring."