Everyone in this world has a guardian demon, to be their servant or protect them from dangerous things

Likewise, Bryan got his guardian demon, and his guardian demon appeared when he was 18 years old, like other people.

He was relaxing in his room when suddenly a light appeared to illuminate his view and when the light disappeared, a tall man appeared with long white hair tied in a ponytail and devil horns on both sides of his head. The man had a flat expression with a sharp, honest gaze. It just made him cringe a little, but he was happy because finally his guardian demon had appeared

He sat on the edge of the bed and looked at his guardian demon enthusiastically and sparklingly, but it seemed like his guardian demon had a quiet and indifferent nature, "Hey!! You're my guardian demon, right?! What's your name?!"

He asked excitedly