Desire. Terms. Payment. Every contract needs them. There are rumors circulating that if you find a blank contract asking for only these things, you can fill out whatever you wish, and it'll happen. College student Issa Aono dismisses this as just another urban legend ... at least until the mysterious paper he finds is accidentally covered in blood and summons an interdimensional wish-granting vampire! It doesn't help that she has no idea how to actually fulfill his contract and is now stuck as his roommate. As Issa adjusts to his bizarre new living conditions, he soon discovers that the world around him is influenced more by these contracts than he could ever have guessed.