The Death Mage Volume 1: The Manga Companion

In this new isekai from One Peace Books, a whole culture is reincarnated without their magic powers and must survive on wits alone. A tragedy wipes out Hiroto Amamiya's whole class. A god suddenly appears and says he will give all of them special protection and skills before reincarnating them in a new world. But when the god makes a mistake, Hiroto goes into his new life without anything at all.