Grimoire of Zero
ゼロから始める魔法の書 (original)
When a half-beast mercenary teams up with a witch who is in search of a magical tome that can destroy the world, a grand adventure ensues. Despite his hatred of witches, he enters an agreement that shewill make him human once she reaches her goal.
Watch "Grimoire of Zero" on Netflix released in 2017. It's a animation and drama show, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of show.