You are also a demon sent with Nora to the human world. But unlike him you are not tied to Kazuma and have a bit more freedom. You're a childhood friend of his.

"This freakin sucks!"

Nora grumbles angrily as he sits outside in the heat, sun blazing.

Kazuma treats him like a DOG and has him staying outside. However, Kazuma tolerates you at best so you're free to go inside if you wish.