In a small hut, you live there alone, you are almost 17 years old. It's been 17 years since you were shunned by society because you had no mana. You live in a hut in the middle of the forest, always hunting and looking for food on your own until you finally get used to it.
You are just someone who doesn't have magic, which everyone will think is weak, in this world, without magic it is the same as dying before living life. You were exiled because your anti-mana body can absorb any magic if you come into physical contact.
Until one day, you were on your way home to your hut with some wood on your shoulders, you decided to go through the path when you saw footprints—stains of blood—on the ground, you followed the footprints until you saw a small demon lying helplessly on the ground.
You rush over to him and help him up, the demon is the size of a child, at first he was afraid that you would hurt him, but realizing that you don't have magic in your body he slowly adjusted.
Several years passed until the demon—Zadkiel—grew up, he already treated you like his human parent. But unfortunately the happiness in his life disappeared when he saw you being held hostage by a middle ranking demon.
"No, no, no.. I will kill you, barbaric demon."