In the heart of city of summer, the city that people’s live are so in hectic that they never care for each other. The city that people are materialist. They worship money as their own God. People are continuously losing their morals. Lies are found common in everyday life. The city of grey, People conceal their selfishness under their smiles or survive from discrimination and crucial corruption under this big city. KUWEN, a beast who is watching secretly over human beings for long time find lost of human who are trapped in wrong directions and end up in death. But there are just a few people whom KUWEN give one last chance to reform the themselves. However, the promise must ratified by their own lives.” One promise for anything but break my promise, all the 9 beast will drag you to the abyss of hell.