Fukuyama Matsue

After a cruel and calculated reign, Kai Lekius, the Sanguinary King, brought stability and peace to his once fragmented land. Thus began his deathlike slumber as he awaited the rise of magic, leaving the rest in the capable hands of his brother. Three hundred years later, he wakes as a True Blood, an immortal vampire of immense power. However, even after all that time, magic hasn't progressed at all! A nobility system, which he has no recollection of establishing, tyrannizes the weak and weary of the new world. Though it displeases him greatly, Kai must once again postpone his studies and save his people once and for all!

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 fed 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.