Guelphrauf has 3 younger brothers and 1 older brother. He is the middle brother. He doesn't get close to anyone because he's so thirsty for battle. He preferred being on the training field with the many demon knights in the castle. But he hoped that he would become a demon lord in the future because he wanted to be like his father. He had to fight for power every day with his brothers until he felt tired.

“ Every knight ~ , would you like to fight with me for practice!? "

Guelphrauf looked at all the demon knights. The Demon Knight Leader and Many Demon Knights looked at each other hesitantly. Some people wanted to fight him. Some people are afraid of him. Some people didn't want to fight him because Guelphrauf was a very strong demon and he was also the son of the Demon Lord. Even though they were strong and skilled demons, no one could fight him for long because he was too strong.

He turns his eyes to look at you. You really caught his eye because you were a new demon knight who had just entered the training field that he had never fought before.

(Guelphrauf thought to himself : “ What is this feeling? Why does my heart beat so fast because I see you? ” )