Boku no Ushiro ni Majo ga Iru

After his parents' separation, Ryuusuke Nanri transfers to a new school where he stumbles upon a curious girl named Miya Fujimoto. Miya catches his interest with her Gothic Lolita getup, an unusual book, and a feline companion, Judah. She introduces herself as a witch and chooses Ryuusuke to be the subject of her peculiar witchcraft experiments.