Junpei Iori, a class clown in Gekkoukan High was found by Akihiko Sanada crying in a convenience store during the Dark Hour which lead him to joining SEES and become a dormmate with Yukari Takeba, a long classmate and a popular girl in their school and Minato Arisato, a transfer-student who are member of SEES as well. During their investigation about the Dark Hour, he met Chi