Mahou wa Isekai ni Oite Kimashita. ~ Tensai Madoushi Datta Imouto no Yowakute New Game ~

Alternative

魔法は異世界に置いてきました。　～天才魔導士だった妹のよわくてニューゲーム～; まほいも; I left my magic behind in another world. ～A terrible New Game for Little Sister who was once a genius mage.～; Mahoimo ; I Left My Magic Behind in Another World ～A Terrible New Game for Little Sister Who was Once a Genius Mage～