Hell's seven Colours to rule Hell's seven kingdoms.

Red, Green, Grey, Blue, Yellow, White and Black.

Satan, the ultimate lord and commander of all seven Kingdoms had made it so.

No one remembered where the Colours came from, or when they last lived without them. It just became a way of life.

The Royal descendants, spawns of Satan, were born with the power to manipulate most Colours. Born with the power to submit most to their will. However, in order to ascend and become true Masters of Hell, they were to pass the final Test. No matter the cost.

Over the years, Satan himself lost many of his children to the Test, but it was the iron law. It could not be changed.

There were some whispers and predictions, however. One of Satan's children, together with a rare human soul, would end his reign.

Along comes Mara.

Twenty-four-year-old Mara Takeda has faced many challenges in her short life. From suddenly becoming deaf at the age of five to facing bullies through most of her school years, she became a near recluse whose sole obsession was painting. Always unsociable and under a pseudonym, her art paved the way for her to become a respected and talented artist.

Now in Tokyo, she is preparing to come out from the shadows and make an appearance at her first, public exhibition. At least that was the plan until she is visited by a man with horns and wings…