In these times when the world is gripped by the threat of heinous crimes committed by those with supernatural abilities known as the Knockers, this town alone is filled with peaceful smiles. The peace protected by the efforts of the great detective Usa-tan brings comfort and security to the people. However, it is precisely because it is such a peaceful town that criminals still appear. Even difficult cases that the police cannot handle are solved instantly by Usa-tan. When in trouble, turn to Usa-tan. That is the motto of this town. Usa-tan enjoys the peace with a bourbon in hand at a hostess club. Let's hope tomorrow will be another peaceful day.