Bungou Stray Dogs, Illegal Rare Recommendations
Both have badass supernatural characters in an agency and bishounen art styles. In Illegal Rare the characters are actual supernatural creatures (such as a vampire) while in Bungou they are humans who have supernatural abilities. They are both pretty funny and quite enjoyable and if you like fantasy manga with well-drawn characters, some humor and drama and some supernatural action, then check the other out!
Illegal Rare and Bungou Stray Doys has secret organizations with their own purpose. These organizations play a prominent role in the story as they undertake dangerous operations. Their roles often puts them in danger as the main characters gets involved with creatures and entities with supernatural abilities. Both series also contains mystery regarding the origins of the characters. I definitely recommend both especially if you are interested in some supernatural mystery fiction.