Shinji Muroi believed in justice and continued pursuing his ideals.
Now, the man who once had no family, will fight to protect “family.”

“I couldn’t keep my promise to him.”
From working tirelessly as an crime scene investigator to striving for the police organizational reform, Shinji Muroi has had a turbulent career in policing.　Filled with regret over his inability to keep the promise he made to Aoshima 27 years ago, he quits the police and returns to his hometown in Akita.
There, he sheds his stern expression, and lives peacefully together with a group of young boys, intending to support the families of both victims and perpetrators, whom he and his colleagues had always overlooked.　Then, a mysterious girl suddenly appears before Muroi, and with her arrival, a dead body, presumably murdered, is also discovered. Her name is revealed to be…An Hyuga.　Shockingly, she is the daughter of the series’ worst psycho killer, Manami Hyuga.
“This is one hell of a body you’ve found, Muroi.”
The sheer number of police officers, helicopters, and police vehicles seem out of place in the remote mountains of Tohoku.　Why is “the worst” targeting Shinji Muroi?　He wanted to live a peaceful life, but now the shadows of an incident are creeping closer once again…