At Zhenjiang, China, the snake-demon sisters, Blanca the white snake and Verta the green snake, challenge the demon-slaying monk, Fahai, to rescue Blanca's husband, Xu Xian. They are defeated, Blanca's hairpin wand gets destroyed and she gets imprisoned under Leifeng Pagoda. Verta blames Xian for being weak and useless, as well as Blanca for falling for him. Verta gets overpowered again and gets sucked into a portal.

Verta wakes up, without her demonic powers, in a modern dystopian city called Asuraville, a place that imprisons creatures from many different eras. She meets a woman named Sun, who helps her adjust to the modern world, and a mysterious masked man with amnesia, who saves them. The main enemies in Asuraville are an army of Ox-Heads & Horse-Faces, led by the Ox Leader who seeks to conquer the city. Sun is killed by the Ox's army, but Verta is saved by the Raksha army, led by a man named Simon, whom Verta gets smitten with.

Simon takes her to All-Good Market to meet the owner, who turns out to be the fox-demon. Verta also meets the masked man again. The fox-demon explains that everyone gets sent here because they have an obsession. The only way to leave is to let it go by discarding their token and jumping into the Pool of Release, but it makes you forget what you cared about and drains your will. Not wanting to forget Blanca, Verta doesn't do it, while the masked man can't remember his obsession. She lets him join them in gratitude for saving her.

Back at Raksha territory, the Ox's army kills Simon's army. While outrunning some evil spirits, the masked man gets stuck and Verta tries to help him, but Simon abandons them upon seeing them as dead weight. The pair survive anyway. Verta learns a lesson that in love strength doesn’t matter, having a good heart does, accepting that her sister was right. The masked man removes his mask, revealing his face resembles Blanca, indicating that he's a reincarnation of her from another era. They go back to the market, you are zar and you meet white snake