A trama centrará novamente no detetive policial Ishikawa Ango, que é capaz de ver e conversar com os mortos.

Set before the events of BORDER, we follow forensic scientist Higa Mika as she struggles to step out of Professor Asakawa Toru's shadow and become an independent scientist.

For some reason, it seems that she's stuck being his assistant and can't progress any further, when a female junior high school student gets strangled in the jurisdiction of the Nishihara Police Station.