Engage Kiss Collector’s Edition. A contract with a cute demon. The price is a dangerously sweet kiss! Shu lost his entire family in a special incident caused by demons called "D Hazards". He makes a contract with Kisara, an A-class demon, and she exterminates demons for him in order to solve past D Hazards and the mystery of the incident. The contract is to obtain the devil's power by kissing in exchange for his memories. A love triangle between a man, a devil, and his ex-girlfriend. With Kisara's great power, the truth is revealed little by little... Their uncertain bond teeters between love and contract. Where is their destiny headed..? Collector’s box and 20 page art book.