Shindou Ranmaru joins the Tokko: Special Mobile Investigation Force after graduating from police academy and is reunited with Rokujo Sakura, a woman from his dreams who works for a secret task force within Tokki. She's part of the group known as Tokko: Special Public Safety Task Force. Ranmaru is driven by a personal motive: avenging his parents' death and solving the Machida Massacre, a series of mysterious mass murders in his hometown.