Miki Otonashi, an armed high school girl, comes seeking help from Anneliese, who runs a detective agency in the wasteland city of Amidahara. Suddenly, their nemesis—the witch known as "White Snake," Li Meifeng—appears before them! Li Meifeng and her cohorts raid Anneliese's hideout, demanding that she hand over Miki. Anneliese flatly refuses out of sheer stubbornness, but then, something unexpected happens to the invincible witch... Has Anneliese fallen into Li Meifeng's trap and been rendered unable to fight?