"Planet Umbra has become a blessed land with blooming life, when the roots of the World Tree spread across the forest, marsh, and the plains. The Beastmen worshipped the World Tree as a holy existence and nurtured it to prosperity. In rich environment emerged the civilizations, and the society of Beastmen followed. There have been bloody clashes over these lands. The Beastmen eventually were united as a country to protect themselves from powerful beasts and barbaric tribes. Thus, the Kartina Association was born. However, conflicts like the 'War of Umbra' and 'K'Earth Field Incident' followed. The Kartina Association experienced tough times, but the Beastmen live flourishing lives under the blessing of eternal life."
— Team Story