I'm guessing out MC has as seal to make him weaker as hinted in a previous chapter. If not then this dude deserves the title as the worst swordsman ever. Imagine getting 100 million years of training and still being hit by a 15 year old. You gotta log out after that
is edge of tomorrow based of this or is it the other way around. I remember seeing a hard copy of this at one of the local manga shops but i never ended up reading it