Looking for a manga about devils/demons. The main character is a guy that is a fitting vessel for the devil or demon king to use in the human world. He uses flames as his power and he have a sword as a weapon. I remember him having a brother that is acting as his teacher in the school he is at and some cat-like demon pet or something.
It was a long time ago that I read it and some of the info might be wrong but people that've read it should probably be able to know which one it is.
Yeah, or it could be the 'pilot chapter' of it ("The Miyama-Uguisu Mansion Incident") included in Time Killers.
________________ "It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)
"Dreams, we say ... If you quit, then it's over. If you never give up, there will always be another chance." (Yume Miru Taiyou)