After Betraying Me, They Regretted It to the Point of No Return

[Dark] [The protagonist is no saint] [May not be a traditional party-kickout story]

To gain wealth and status, they betrayed the guildmaster who had always looked after them.

But they never imagined that retribution would come so soon.

When the surging demon army swept over the fortified city and the traitors' heads were displayed before her, what despair would fill the heart of the Saintess, the mastermind behind the betrayal, as she gazed at that familiar face?