Yuzuki Kirishima is a demon, and bored out of her mind. After being an English and Science teacher at Samezukou Academy for the past 4 years in the human world, she yearns for a more enigmatic and interesting life. And she finds it in Chiyo Akiyama: a peculiar and ancient demon. The two find themselves caught up into a whirlwind of chaos, murder and demons, when Chiyo's even more mysterious younger sister begins a hunt on the two for an unknown reason. With the entire underworld after the two demons, they can only rely on each other as a passionate love between them beings to bloom.