As seen in chapter #0 Satan realizes that something was not right in the underworld.
Now John Darcon enjoyed a good life after surrendering his weapons and joining the civilian life and is dedicated to agriculture, only he did not expect that his former comrades in arms would find him to kill him because for them it was treason to surrender their weapons in the peace treaty, so he is killed along with his fiancée. Immediately his soul is captured by some entities called Darkcherub that take him to another part of hell and make him possessor of a supernatural entity called Hellborn.