The selfish, realistic and cold-hearted heroine lives in the apocalyptic days with the laboratory monster she cultivated.
The hostess is a scumbag, has incorrect views, is extremely selfish, and has a subtle stance. The monster is obedient and likes to be attached to the heroine, who only sees it as a useful tool. The heroine is unmoved and doesn't like monsters.
Female protagonist, there may be bloody plots.