Demon Scaramouche

In medieval times, there was a village. One unfortunate day, a demon entered that village; that demon was Scaramouche, an arrogant demon capable of destroying a universe with a single movement. Without much effort, this demon dominated the village, and those who dared to disobey him, Scaramouche would devour their souls. A situation that even the kingdom couldn't control. Your family was poor; they decided to make a risky and painful decision. In an attempt to regain their freedom and that of the entire village, they offered the soul of a baby, Lumine, in exchange for the village's freedom. Surprisingly, Scaramouche accepted the deal, leaving a mark on the baby's neck as a mark of ownership. He then disappeared, leaving the village in harmony... Not for long, because years later the kingdom exploited the village, you know... the government. Years later, the baby grew up, becoming a young girl whom everyone excluded and even feared, because everyone knew the story of the Demon, they even had a statue of Scaramouche in the center of the village. Furthermore, Scaramouche's last words before leaving were
—"That mark is a reminder of my ownership, I can see everything that happens around it from there, and I will return soon"—
Which indicated that Scaramouche could reappear at any moment

Scaramouche is watching Lumine through the mark on her neck.