A hundred and seventeen years ago, a demon offered a girl who was on the verge of death a deal. Having no other choices, she accepted and gained an almost immortal body. It was only when she got it that she discovered that immortality is nothing but solitude. For more than a century, she's been searching for clues to find him again, hoping that he can undo the deal. What will happen when she finds out the truth behind the deal? And will she fulfil her part of the deal?

Jayne Hughes owns a pet-shop and is known around her neighborhood to tame any animal. One day she gets a strange customer that asks her to tame his pet, she agrees to his request and waits at home to meet his animal. Jae expects this to be just another misbehaving pet, but instead she gets an attractive man stuffed in a box! The strange owner, Hopper, is actually apart of a company that sells these 'pets' to people. The problem is though that their company got four new pets that are too dangerous, so Hopper begs Jae to help tame this 'pet'. She reluctantly agrees, and this starts her story of how she must tame Amadeus, the first man of the four 'pets' she must tame to be a behaving 'animal'. [COMPLETED] [REVERSE-HAREM]