Gyaku Isekai Tensei shite Kimowota ni Natteshimatta Daimajutsushi Delrey Curtis Fujouri na Nichijou  

Isekai Tensei Shite Kimo Ota ni Natte Shimatta Daimajutsushi Del Rey Karchs no Fujouri na Nichijou, The Absurd Everyday Life of Great Sorcerer Delray Curtis who was Reverse Reincarnated, 異世界転生してキモオタになってしまった大魔術師デルレイ・カーチスの不条理な日常

The story revolves around Delrey Curtis, a magician from another realm who gets transferred to our world after an eventful occurrence. He takes on the form of Mikado Kuroikazuchi, a Japanese high school student, but despite being familiar with his previous world, he can no longer utilize magic in this one. Meanwhile, Mikado is disliked by those around him because of his demeanor and character traits.