Demons, angels, and humans all live in the same world, but their identities are unknown. Unlike the other angels and demons book where they are in war, instead the angel princess and demon prince are suppose to get married, to unite the two different kingdoms. The angel princess, Lissana Strauss, is finally getting married to the man she has fallen in love for years. On the other hand, the demon prince, Natsu Dragneel, wants to pick his own beloved wife, not his fate wife. During the ceremony, Natsu puts the ring on Lissana's finger, but the ring didnt react to Lissana at all! Then, a human girl, Lucy Heartfillia, bumps into Natsu Dragneel. Meeting Natsu will change Lucy's life forever. Will love grow between Natsu and Lucy? But if it did, humans and demons cannot marry or date each other, so their love wouldnt be a normal love, but an illegal love...or is it?