Shikkakumon no Saikyo Kenja: Sekai Saikyo no Kenja ga sarani Tsuyokunaru Tame ni Tensei Shimashita 17 (Gangan Comics UP!)

[Machine Translation] Regaining his former power... the strongest sage Gaius is back! A wizard who was once called a "sage" was reborn in the future in search of the best crest for magical combat. However, in the future where magical theory has degenerated, the desired emblem is called a "disqualified emblem" and is despised. It was the demon tribe that distorted the information in the sigil and degenerated the magical theory. Matthias is engaged in a battle with the demons who are trying to destroy humans! A piece of a cosmic demon called "Nekkisei," which transcends magical theory. The power of the "Necrostar" is said to revive ancient and powerful demons one after another, and if left unchecked, will destroy the human race in three years. In order to eliminate the power of the "Nekkisei," Matthias and Iris attack a group of revived ancient demons...!

かつての力を取り戻し…最強賢者ガイアス復活！！かつて【賢者】と呼ばれた魔法使いが、魔法戦闘に最適な紋章を求めて未来へ転生。しかし魔法理論が退化した未来では、望んだ紋章は「失格紋」と呼ばれ蔑まれていた。紋章の情報を歪め、魔法理論を退化させたのは魔族。マティアスは人間を滅ぼそうとする魔族との戦いを繰り広げていく！『壊星』と呼ばれる、魔法理論を超越した宇宙の魔物の欠片。その力で古代の強力な魔物達が次々復活し、放置すれば3年で人類が滅びるのだという。『壊星』の力を排除するため、マティアスはイリスと共に、蘇った古代の魔物達の群れに突撃する…！