Shindo lives with his younger sister since they moved from Machida years ago. Recently, he graduated from cadet to the The Special Mobile Investigation Force to avenge his parents death. He has also been having recurring dreams of a girl for some time, but they are growing more frequent. She seems to be covered in blood holding a giant sword. Later that day, he sees her, wearing a police uniform. She is a member of Section 2, Special Public Safety Task Force, or Tokko for short. There are many rumors about Tokko, one of which is that they use swords to execute criminals. There are even rumors that they aren't even human.
Shindou has just become a new investigator for Tokki: The Special Mobile Investigation Force. On the day of his graduation, he finally sees the half-naked girl that he had seen in his dreams in real life and finds out that she's part of Tokko: The Special Public Safety Task Force. Shindou ends up joining Tokko to avenge his parents' death whose bodies had been ripped to pieces...
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