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In the distant future the human race is forced to live underground because the Triacanto, an alien parasite, exterminate anyone outdoors. This is lived hidden in some human bodies for thousands of years, until finally develop in Great Germination.
Lyca is a girl trained since childhood to hunt down and destroy all traces of Triacanto in the past, before the Great Germination, in order to avoid the bleak future of humanity. Has inhuman powers that lead her to be called with the name of Lilith and is accompanied by Dark, his leadership aether, that only she can see and hear, and that has the form of a quadruped halfway between a dog and a tiger with black fur.