Takeshima Ryota has followed in his father's footsteps and now works as a prison officer at Kitakanto Prison. He has witnessed corrupt prison officers who tolerate bullying and gambling. Nakui Soichi then becomes the newly appointed prison chief. Soichi gives an order to Ryota, informing him that he will get rid of prison corruption. ~~ Adapted from the 2014 novel "Hitoya no Toge" by Daimon Takeaki.