2-Shuume no Daimadoushi wa Kinsetsu Mahou de Musou Suru

An invasion by the Death God Vidrak leaves humanity on the brink of destruction as powerful mages are rendered ineffective against his forces. Faced with overwhelming odds, Setsuna Cromwell, a long-range mage, activates the Amulet of Resurgence to return to the past, ten years earlier. Given a second chance as a freshman, he abandons his usual magic style and begins training in close combat magic, a less respected form considered his only viable option for defeating Vidrak.