The Lightning Bokukko and the Otherworld High School

Takumi, a second-year high school student, suddenly falls into an unknown world. When he wakes up, he is in a world where magic is completely normal. Ars Almal, a witch-girl wearing a big hat, finds the collapsed Takumi. Ars is a VTuber from Nijisanji, a novice magician from another world. She has a cute, squishy voice and a sharp tongue, but she is surprisingly caring. To find a way back to his own world, Takumi transfers into the magic academy that Ars attends. However, this academy has an ex