Isekai, some slice of life, mainly magical military.

A man named carlos viega wakes up in the middle of nowhere. Carlos was sent down to this world on a mission. In a few years an invasion of unimaginable proportions will come and it is up to Carlos with his ability to inscribe runes that can alter the very fabric of reality. He must find a way to fend of the horde or else this world is doomed.