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.
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.
Watch it here
Not found streaming from United Kingdom.