The Girl and the One Who Shouldn't Exist

a random day in the year 1500 in Alradon in the middle of a clearing a boy in armor appears unconscious, his only clue is that in his vision there are information that only he can see with his Devil Eyes and a message from his mother This world was once prosperous but in 2030 after Christ there was a cataclysm that destroyed more than 40% of humanity, that was not the worst, after that two mysterious forces awakened, mana coming from creatures and nature and ki coming from life Along with these forces came many "alien" peoples like the Elves, Demons and Fairies, but atrocious creatures like the Kraquen and the dragons also came. But this boy falls into a trap and is switched places with his parallel self in a world that has not yet awakened Mana or ki but is much more advanced in technology, and in a life where his parallel self committed suicide is he will have to go to a school and live with his grandfather in this new life and maybe find his first love, well that's what he thought