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The Kaka are a clan of seemingly humanoid cat-people. Genetically engineered from the beast-man Jubei, one of the strongest creatures to exist, the Kaka were originally intended to be used as weapons against the Black Beast during the Dark War.

The Kaka reside in the Lost Village, directly under the The 13th Hierarchical city of Kagutsuchi. When the Dark War had ended, it left large amounts of seithr that covered most of the world. Humans were forced to move to high-altitude areas and began to build hierarchical cities. As a result of the hierachical city being built on top of the Kaka's village, they were slowly forgotten.