The time is 1927. As the conflict over land accelerates even after World War II, Shanghai is a city where various races, cultures, and even Ayakashima are mixed up as an international free city with autonomy. In this town called "Mato", Hanarin, who runs the teahouse "Shiroja-tei", was a half-youkai girl who draws the blood of a great youkai woman. In the magical city where people's speculations and signs of suspicion drift, the owner of the teahouse and the strange boarders challenge the mysterious incidents that come in one after another !!