Kassan, the youngest domestication director at Windridge and the only one who can control the nine-headed giant serpent "Blackfang." Her husband Des, coveting her domestication genes, patents, and inheritance, sets a trap for Blackfang to crush her to the brink of death and abandons her body in a graveyard. Kassan, having accidentally triggered a genetic symbiosis mechanism, resurrects from death and immediately joins forces with serpent tamer Auri for revenge—only to discover that the rescue was no coincidence: a deeper web is quietly closing in.