Treasure Word Puzzle

An ordinary young man accidentally encountered a sword, but he was involved in a dispute between magicians. Overnight, an ordinary person who disdained magic became the magic world's greatest hope. Just when the burden of responsibility overwhelmed him, another blow struck: his biological sister somehow joined his enemies and was forced to fight to the death with him. Facing an enemy several times more powerful than himself, his only chance of victory is a word puzzle left to him by his leader before his death. However, while he was still unable to solve it, the enemy's plan was succeeding step by step...