Near the residential area of Machida, a massive "hole" appeared due to widespread ground subsidence. At the same time, all 185 households living in the area were brutally murdered without exception. Mysterious and terrifying murders occurred one after another, seemingly not the work of humans, yet no clues were left behind. These incidents appeared to be connected to an enigmatic old man and a forbidden relic known as the "Durji Box." Five years later, in near-future Tokyo. On the surface, it appears to be a prosperous metropolis, but in reality, it is on the brink of destruction. A polarized city of crime. Shindo Ranmaru, the sole survivor of the Machida tragedy, became a police officer to uncover the truth behind the incident. Then, a new case emerged in Shibuya. It was reported as a violent incident involving drug addicts, but when Shindo and other officers arrived at the scene, they clearly witnessed monstrous beasts ravaging people. Coming to the rescue were members of the Special Mobile Investigation Unit 2, Special Public Security Department, commonly known as "TOKKO," including Sakura Rokujo and others. Their weapons were neither guns nor batons, but tachi swords used to slay the monstrous beasts. Shindo finally realized that Japan would be destroyed within two years and embarked on a tragic path of battling the monstrous beasts...