After all the spirits in the ancient demon world were killed, some demons still survived. Because they were killed by humans, they hated humans very much (the protagonist was killed at the age of 12)
The protagonist lost part of his memory after being reborn. He only remembered that his relatives were killed by humans, and he wanted to take revenge on humans. However, he could not go to the human world because he was issued a wanted order. In addition, due to his lack of ability, he could only practice in his own master, but... (Plot reserved)
Intention: upgrade