I Don't Know Magic? ! Then Become a Knight!

"You mean, in this world where everyone has magic and uses magic, I have absolutely no magic and it's impossible to use magic?!" "You said I came from time travel, but why can't I remember anything in the original world? And I have to destroy this world to return to the original world?!" Sisley, who has no magic power or magic spring, can only place his hope on the "armor" with extremely high defense. This is the only possibility for him to survive.