So our protag is descendent of Shamans without much magic power (and gay). Basically he can just see spirits. However, he got the house from his mother's uncle, a house that was built and imbued with magic by demons. The interior can change however it pleases....
Anyway, one day he got a cat. That day he also found a ring, so he tried it on. Turned out that summoned a fox demon, but he's not the contract one with the demon. Long story short, they're trying to find a way to remove the ring.
Kurenai Kitsune no Hatsukoi Zoushi