Stuck in a Time Loop

Summoned to the castle alongside five supernatural guardians, Selene, the Guardian of Shadow, is greeted with terrifying news: An entire city is being endangered by a catastrophic-level beast! As the others prepare to fight, Selene takes advantage of the chaos and puts a plan to steal the king's and her allies' powers into motion. With those, she can unlock the secrets of the ancient stone slab.
Can Selene finally break free from her nightmarish loop of death and humiliation? The manga's thrilling conclusion awaits!