Ichi the Witch, Vol. 1 by Osamu Nishi

In a world where only women can be witches, one unsuspecting boy acquires their power.

Magic is alive and well in the world, inside beings known as Majiks. By completing a Majik’s trial, a Witch can gain its power. However, only women can become Witches or use magical items. All that changes one day when a young man named Ichi turns the world on its head by defeating an infamous Majik and gaining its magical powers!

Ichi is a reclusive hunter who knows nothing of Witches and Majiks, but he does have a particular obsession for hunting anything that exudes bloodlust. When that instinct leads him to interfere in a battle between the great Witch Desscaras and the horrifying King Majik Uroro, against all odds, he acquires the destructive magic of Uroro, making him the only male Witch in the entire world! And not even Desscaras herself is prepared for the absolute headache that wild child Ichi is about to give her.