Yukito Matsuno

A very ancient monster, Okamuro San, appears to those who say his name or search for him on the internet to chop off their heads...

YouTuber Tomoki Uchikawa, along with his friends Hinako, Souta, and Nanae, head to the former Ishio Village, where there are rumors of people being spirited away, to film a video investigating urban legends. However, their whereabouts remain unknown, and the police discover the rental car they had rented near a tunnel on the outskirts of the village. The video cameras left behind there show shocking images of locked houses, children in armed uniforms, imprisoned adults, and adults being infected by a strange disease, a rotten demon, that occurs on the night of a new moon.

A brutal serial murder occurs. The detective uses a time machine to reach out to prominent Japanese violent criminals across space and time. He asks for help in arresting the criminal ...