Five years ago, a portal to another dimension opened in an apartment building, unleashing monsters that killed 300 people. Survivor Ranmaru Shindo has become a member of the elite Mobile Investigation Force. Ranmaru's dreams of his parents' death begin to come to life as the same mysterious creatures that killed his parents return to claim more victims. Ranmaru's investigations of the murders are interrupted by a secret branch of the police known only as Tokko. Will Ranmaru be able to unravel the mystery behind his parents' death while investigating this mysterious police force? Find out in the horror-packed first volume of Tokko.