Iwaizumi Hajime is a middle-class angel, watching over the devils in Japan. He spends his days talking to his partner, Kindaichi. You couldn't totally consider them friends, but they got used to each other's company and found themselves safe with each other's presence. They'd often confide in each other when the going got tough and they managed to pass the eternal days that passed over them, although Iwaizumi longed to be a devil - but that was the one secret he had to keep. Oikawa Tooru, on the other hand, isn't just a normal devil. He's soon to be the devil himself. Along with his somewhat annoying side chicks, Hanamaki Takahiro and Matsukawa Issei, he protects Hell and all of it's inhabitants. Although sometimes he has other ideas, like invading Heaven and pissing off the Angels who were once his closest friends. Unluckily for the angels - the side chicks agree with him. Now all that's left for Oikawa is surpassing the devil and heaven will be his. What happens when the confidential angel and the mischievous devil cross paths?