Eiyuu to Majo no Tensei LoveCome

Eiyuu to Majo no Tensei LoveCome summary:

Choose the world or choose her. Ordinary high school student Shiraishi Godo harbored a "secret" - he possessed memories of a past life. In a world different from this one, he was a "hero" who saved humanity. However, that was a story of his past life. In this life, he was supposed to lead an ordinary school life—until the arrival of transfer student Mai Shiina turned everything upside down.