As the MEJ team celebrates news that forensic pathologist Rensuke Takamori is about to become a father, they are called to investigate an unconscious 11-year-old boy who, before collapsing, spoke fearfully of a “black monster.” While suspicion falls on his mother’s abusive boyfriend, Takamori is shaken by signs of child abuse that awaken memories of his own traumatic past. As the investigation uncovers the darkness of generational abuse, Takamori must confront both his fears and his future as a parent in order to uncover the true identity of the “monster” the boy saw.