Kouryakuhon o Kushi Suru Saikyou no Mahoutsukai ~< Meirei sa Sero > to wa Iwa Senai Oreryuu Mao Tobatsu Saizen Ruuto ~The Strongest Wizard Making Full Use of the Strategy Guide -No Taking Orders, I’ll Slay the Demon King My Own Way-; 「攻略本」を駆使する最強の魔法使い ～＜命令させろ＞とは言わせない俺流魔王討伐最善ルート～; "Kouryakuhon" o Kushi Suru Saikyou no Mahoutsukai: <Meirei Sasero> to wa Iwasenai Oreryuu Maou Tobatsu Saizen Route; Сильнейший волшебник, использующий "Книгу Мира" наполную; '공략본'을 구사하는 최강의 마법사 ~명령할 여지를 주지 않는 자기류 마왕토벌 최선 루트~; 带着攻略的最强魔法师; 「攻略本」使者的最強魔法師 ～不聽＜遵守命令＞之言的我流討伐魔王最佳路線～; The Strongest Wizard Who Makes Full Use of the "Strategy Guide": The Best Route for Subjugating the Demon King

Magnus, a mage who always got yelled at "just shut up and follow my orders!" by the Hero because he was deemed "useless". One day after getting feed up with his party he left, upon leaving he met a merchant that sold him a mysterious book. And it turned out that the book which was written in the god's language was actually an ultimate encyclopaedia book that had a lot of useful information on how to defeat the Demon Lord! Thanks to that book, he was able to know about boss monsters' weaknesses and raise his level more efficiently, data about important people, and it even had info on complete gourmet spots in any city! Moreover, by using his wits and scheming mind, he's even able to outclass the hero party! With the ultimate encyclopaedia in his hands, advance to the true route to defeat the Demon Lord! Magnus wasn't chosen by destiny to be the hero. That's why, He's going to beat the Demon Lord with his own power and wits and save the world.