Takashi Iwasaki's Manga List

Saybil is a magic student with no memories of his life before he met a mysterious silver-haired woman in an alley. Now he travels with his teacher, Loux-another student, Holt, and the beastfallen Kudo for "special training"... but this field trip may not be as routine as it seems!

A world of sorcery, without knowledge of magic.

One mercenary, who is called "beast-fallen" (half beast, half human), was being hunted down by witches for his head is said to be an excellent instrument for their sorcery.
But he can't get caught before his dream comes true...becoming human being.
The one day, he was saved by a witch in a forest. She says that she is looking for "Grimoire of Zero", a book about magic which can destroy the world.
Her name was Zero...and she was the great witch who found magic.
The beast agrees with Zero to go with her...thus the journey begins.

After quitting his job at a toxic company, Shiro Amata moves into the house his grandmother left him in her will. There, he soon makes two life-changing discoveries: one, his grandmother was really a witch from another world, and two, said other world is just on the other side of her closet door! Thanks to a book she left for Shiro, he also manages to obtain an all-powerful skill called "Equivalent Exchange," which allows him to turn money from his world into otherworldly currency and vice versa.

With this, Shiro decides to set up shop and sell convenient items like matches to the colorful inhabitants of the other world. His plan: make a massive profit on the goods he brings from home to become so rich that he never needs another job ever again!

Based on the light novel of the same name.

Saybil, the worst student in the short history of the Royal Academy of Magic of the Kingdom of Wenias, has no memory of his life before he enrolled. Nevertheless, Headmaster Albus sends him out into an unknown world, ordering him to take part in a special field training program in the South, where anti-witch sentiment still burns strong. Accompanying him are star pupil Hort; Kudo, the Academy's only beastfallen student; and their unusual chaperone: Loux Krystas, the ancient Dawn Witch, whose only goal is to peruse the pages of the legendary Grimoire of Zero, source of all magic. But as they journey south, nothing will be what they expected...