The Juuza. That is the name given to those of the 13th Zodiac: the cat people. Seen as a vulgar and contemptuous race, they live a life of seclusion away from human eyes. However, as the end of the Han Dynasty draws near, the rise of the Yellow Scarves has thrown the land of the Three Kingdoms into turmoil. As armies converge, a young Juuza woman named Kan'u and her village are forced out of their peaceful lives as Sousou and his punitive force press their way into the village.

During the Taishou period of early 20th-century Japan, Haru Asagi is sent to work as a maid to support her struggling family. The Miyanomori family, which she serves, is highly influential across Japan and consists of one of the nation's top magnates and his six sons—but power and money have brought out the cruelest in these brothers. When the head of the family announces his retirement, the six Miyanomori brothers are left to vie for his position. With 18 years of experience separating the oldest and youngest brothers, frustration and competition are rife. As a result, Haru is left to deal with each of the vastly different siblings and explore the depths of their true selves. All the while, a greater conflict lies in wait with the potential to destroy everything their father has built for them.

The story is set in December of 2199, when the streets are full of anticipation for the end of the year and the start of the new one. Amid the celebrations, word spreads that Ragna the Bloodedge, an SS-class rebel with the highest ever bounty on his head, has appeared in the 13th Hierarchical City of Kagutsuchi. The apparent aim of Ragna or the "Grim Reaper" is the destruction of the system controlling the world. To collect the bounty, a motley array of unrivaled fighters converge on Kagutsuchi. (Source: ANN)