Taeko and her husband, Jiro, are living a peaceful existence with son, Keita. A tragic accident brings the boy's father, Park, back into her life. Taeko throws herself into helping this deaf and homeless man to cope with pain and guilt.

A portal transports Lt. Artemis and an elite unit of soldiers to a strange world where powerful monsters rule with deadly ferocity. Faced with relentless danger, the team encounters a mysterious hunter who may be their only hope to find a way home.