Description:

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! (Source: J-Novel Club)

Alternative Titles:

魔術の果てを求める大魔術師～魔道を極めた俺が三百年後の技術革新を期待して転生したら、哀しくなるほど退化していた……～, Majutsu no Hate wo Motomeru Daimajutsushi: Madou wo Kiwameta Ore ga Sanbyakunen-go no Gijutsu Kakushin wo Kitai Shite Tensei Shitara, Kanashiku Naru Hodo Taika Shiteita......