An old apartment house in downtown Plague with a signboard of 3 frogs...
A woman lived there with twin kids some ten years ago.
Tenma learns that from neighbours, they also tell him about the Czechoslovakian secret police and a questionable fire.
Could the twins be Johan and Anna??
Meanwhile, Suk, a young detective of the Plague Police, gets attracted to a beautiful girl he met in a bar.
Her name is Anna!
When Tenma and Suk meet, another terror creeps up on Plague!
HQ, comics, mangá