I Reincarnated as a Mob Character Who Can’t Use Magic, But I Rise to the Top with the [Ultimate Sword Technique] Only I Can Use ~The Man Who Became the Older Brother of His Favorite Villainess Slices Through the Doomsday Flags and Runs Rampant in the Game World~

Soldo, a young boy, is reincarnated as a countryside noble in the world of a magic game. He is excited about the adventures he will be having in the game world he has played countless times in his previous life, but he is confronted with the shocking truth that he has no talent for magic...!
Unable to use magic, Soldo is destined to live as a worthless mob character with no impact on the story, but one day he discovers a book about "secret swordsmanship" hidden within the game! He soon learns of the flags that will lead to his ruin, but he will slash them away with his strongest swordsmanship!