A brief description of the Moto Saikyou No Kenshi Wa, Isekai Mahou Ni Akogareru manga:
One day, the memory of a past life came back to Souma. The guy remembered that he had always wanted to be a magician, but that same day he was baptized with mediocrity and told that he would never succeed in anything. But Souma was not desperate and decided to learn magic by all means. Ancient ruins, underground labyrinths, a demon’s lair, a witch’s forest… Any place where magic is rumored to exist, our hero will not hesitate to go!