Eiyuu to Majo no Tensei LoveCome

Synopsis:

Choose the world, or choose her. Shiraishi Godo is just an ordinary high school student… or so it seems. In truth, he carries the memories of a previous life—one where he was a "hero" who once saved another world from destruction. But that life is behind him now. Determined to live peacefully in this world, Godo settles into a normal student life—until a mysterious transfer student, Mai Shiina, appears and disrupts everything. With her arrival, the boundary between past and present begins to blur, forcing Godo to confront an impossible choice: protect the world once more, or protect the girl who’s come to mean everything to him.