Shortly after the end of the war, Kindaichi KÅsuke, visiting a remote island in the Seto Inland Sea, arrives at the powerful KitÅ family on the island guided by the monk Ryouzen. There, Kindaichi encounters a beautiful woman named Sanae and encounters three sisters with unconventional and outlandish appearances that don't quite fit the island's atmosphere. And then, one evening, the youngest sister disappears... Kindaichi KÅsuke is rebooted into action!