Saving Another World: Starting with a Crutch

A young man who was good at swordsmanship traveled to a different world and was mistaken for a magician. But he became the princess's knight by accident. By accident, I gained mastery of the strongest swordsmanship system, magic, and alchemy, completed tasks one after another, and defeated boss after boss. Finally became the strongest swordsman in another world and saved the other world? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.