The Zodiac Contract Between Humans and Animals

When human civilization was shattered in the "Great Collapse", the survivors hid in the last twelve "Ark Cities". Here, everyone can sign a contract with the "Zodiac Reverberation" to gain power, but the price is the gradual annihilation of humanity. An "Experimental Subject Zero" escaped from the laboratory, carrying the curse of "controllable madness", trying to rebuild human dignity on the ruins.