From Overshadowed to Overpowered 4 (Kadokawa Sneaker Bunko) [Light Novel]

[Machine Translation] When Eftal learns of Sasha's disappearance, he decides to leave the academy and head for his hometown, the Duchy of Olcott, in order to retrace her footsteps. He goes to the Dragon's Treasury, where the materials needed to normalize his magical aptitude lie, but the caretaker, the Dragon Princess Svetlana, offers him a condition: he must return to the Duke of Olcott's estate and find the "Treasure of the Underworld," which has been stolen by an alien race. She is given a condition: she must retrieve the "Treasure Pearl of the Underworld," which was stolen by a different tribe. The border guards are in a great struggle against the alien race that has attacked the fortress in their territory. As despair spreads over the battlefield, Eftal, the Thunder God Emperor, dashingly appears and begins the great overthrow of the century! What are the true intentions of the missing Sasha? All kinds of thoughts intersect in this fantasy of the Academy of the Strongest Wise Men!

サーシャの失踪を知ったエフタルは、その足跡を辿るため、学院を出て故郷であるオルコット公爵領へ向かうことに。自身の魔法適性を正常化するための資料が眠る、龍の宝物庫へと足を運ぶが、管理人である龍姫スヴェトラーナから条件を提示される。それは―異民族の奪われた“冥界の宝珠”を手に入れてくること。そんな中、領地の砦を襲撃してきた異民族に対し、大苦戦する国境警備隊。戦場に絶望が広がる中、颯爽と現れた雷神皇・エフタルにより、世紀の大蹂躙が開始される―!目前に迫る炎神皇との邂逅、失踪したサーシャの真意とは!?あらゆる思惑が交錯する、最強賢者の学院ファンタジー!