The late 19th century was not a happy time. For anyone.
The Bunian Empire of Tanzania, an empire located in the northern Mediterranean, has just secretly concluded a cleanup incident. Kino survived as a remnant of that incident.
Originally holding the title of an idle nobleman in Tanzania, Chino lived a free life, but this life was completely disrupted by a letter from the queen one day.
Following the Queen's order, Kino went to the mysterious and legendary mansion of the Queen's blood relative Mia Tanzania. However, he encountered a series of events, including vampires, churches, demons, mysterious infected people... Mysteries emerged one after another.
Mia: If you want to understand the thoughts of living creatures living in the dark, you have to become like us, okay? Can it be done? Stupid people.