Ningen no Kaikata

Every few years, a human appears out of nowhere in the world of demons and monsters! You have to be careful with them—their stomachs can barely handle demon food, their bodies are fragile enough to break from a little fall, and even turning up the heat by a few dozen degrees will make them wither away...But they're also cute, loyal, and clever in a way une (dogs), nosa (cats), and eshig (rabbits) just can't compare! How could you not want to keep a human?

(Source: Yen Press)