Demons transform into humans and live in this world together with humans. They rely on capturing human heartbeats, collecting spiritual energy, and practicing spells.
And a nine-tailed fox demon relied on its innate handsome appearance and charm skills to seduce countless people, harvested the most spiritual energy, and became the demon king; the fox clan also relied on its outstanding wisdom to build a business empire in the human world, but he fell in love with her by accident. He married a human girl and signed a deal with the gods to make the girl's heart beat a hundred thousand times to make her forget about him. At the same time, ghosts and other demons are eager to take the position of the demon king. The demon world is in chaos. Can the girl help the demon king revive the demon clan and maintain peace between the two worlds?