Highschool DxD: A Minor Tale

A regular man ends up dying and miraculously reincarnates into Highschool DxD! A world of magic, swords, monsters, devils, and gods! With all the knowledge he has in his back pocket will he change the plot or use it to his advantage? The possibilities are endless! Though there is one small problem, he's about 400 or so years before canon and oh yeah he's human. Let the show begin!