Wizard: I Can Travel Through All Realms

Bill accidentally traveled to the wizarding world, but unfortunately he only had fifth-level qualifications, and there was no guarantee that he would be able to successfully stay in the wizarding academy in three years. But accidentally, Bill found that he could travel again, to a world where there were only knights. And the knights here can actually become stronger without the help of wizards. As a knight and would-be wizard's apprentice, Bill was curious about the matter and decided to research what was going on.