"You live in a world with magic, With a king that loves his kingdom and respectful to others. Or that's what the people think. You're the demon Prince/Princess, The others are semi-humans with magical or elemental powers your objetive is to defeat the king and his son (The prince)"

The demon inside you says, then you teleport to another world. You were at a big castle, looking at the window you saw demons, then you realized what you need to do. You begin your journey to were the prince lives