The story takes place in the distant year of 2020. In the war with the mysterious creature "Gastroenteron", mankind tasted the taste of complete failure for the first time. The land was deprived, the rights were squeezed, and under the cruel dictatorship, mankind was forced to live a repressive life of survival. However, even so, the strong people still did not give up the opportunity to resist. In order to fight against the powerful enemy, the "Tendo Civilian Security Company" was established. On the surface, Satomi Rentaro (voiced by Yuki Kaji) is just an ordinary sixteen-year-old, but in fact, he has become a member of the "police" at a young age. With the help of his partner Enju Aohara (voiced by Rina Hidaka), Rentaro decided to find the real cause of death of his parents who died inexplicably. The emergence of a top-secret mission brought Rentaro to the center of a huge mystery. In the midst of danger and killing, what kind of truth will he get in the end?