Kowloon Walled City, a neighborhood between two big countries, was infamous for being a law-free area. Although the city was a refuge place for the demi-humans, there were rumors that Fon-Hap-Ui, a mafia in the city, was secretly selling demi-human kids as slaves. Won, a cat girl and a newbie detective, visited the city to investigate the mafia.

九龍城塞を訪れた亜人の少女・黄（ウォン）。
探偵見習いである黄が繰り広げる探偵アクション4コマ！