The Villainess Turns the Hourglass, Vol. 6 (manga)

The day of battle is approaching, and though Lady Isys has a growing uneasiness about the whole thing, the gears have been set into motion and it is much too late to stop them. Her anxiety is proven justified, however, when it’s revealed that King Rohan has been in cahoots with the Crown prince all long! After years of careful planning and deliberation, when Aria sees Mielle on her knees awaiting execution, she realizes it may be time to reap her rewards—only, the best things in life should be saved for last, right?