The exact number of demons is impossible to calculate.
Just within the Minotaur Chieftain's stronghold alone, the number of demons has surpassed the four hundred thousand mark, not counting the Minotaurs, Jackal-wolfmen, and other dark creatures mixed in.
After Flora killed the Desire Demon, the scales of victory started to tip, and along with the sudden attack of the Frenzy Legion, the Devils' plans were instantly disrupted, causing the Devils to appear to retreat. The battlefield situation was overwhelmingly clear, and staying had no meaning.
Even foolish demons would choose to leave when at a disadvantage, let alone the somewhat intelligent Devils; they wouldn't make meaningless sacrifices.
At such a time, they did not linger at all, but instead began to scatter backward with all their might!
