Synopsis Of "Jukkakukan no Satsujin"
It follows the story of Nakamura Seiji, the architect and owner of the Decagonal Building mysteriously died in the main building, seven men and women from the University's mystery research group visit the uninhabited Tsunojima Island, where the building is located, for a training camp. Around that time, Kawaminami Takaaki, a former club member, receives a letter from the supposedly dead Nakamura, and teams up with Shimada Kiyoshi to investigate the truth behind the mystery surrounding Tsunojima.