Alphina, a princess of the Lione Empire, has been executed for a crime she did not commit a total of ninety-nine times. Falsely accused of plotting to assassinate the kingdom's saint, her engagement to the cold-hearted Prince Lionett is brutally called off before she is sent to the guillotine, only to have time rewind to the moment of her arrest each time she dies. Despite countless desperate attempts to prove her innocence, escape, or even use comedy to change her fate, she has failed every single time.

As her one-hundredth loop begins, a new power finally awakens within her: the ability to hear the true thoughts of those around her. What she discovers flips her entire understanding of reality upside down. Her so-called accusers do not hate her at all; in fact, Prince Lionett, her family, and even the court are secretly deeply in love with her, despite passing a death sentence on her face ninety-nine times previously. Armed with this telepathic ability, Alphina finally manages to expose the true culprit, the malevolent Saint Debonaire, and seemingly claims her victory.

Believing the nightmare to be over, Alphina fakes her death and flees the capital to start a quiet life in a remote forest as a commoner named Arle. However, her peaceful retirement is short-lived. Prince Lionett, still bleeding from a fight, stumbles onto her doorstep. He not only reveals that he has always adored her, but also delivers terrible news: Saint Debonaire has escaped from prison and fled to the enemy Heavenrose Kingdom, potentially dragging both nations into a world war.

Alphina is thrust back into the conflict to prevent a catastrophe. Her journey takes her to the Heavenrose capital where she allies with an underground insurgent group called Mordeus Scythe, led by the Empire’s brilliant strategist Kithling, who is also the Prince’s right-hand man. Along with her beloved younger brother, Carl, she prepares for a final showdown with the Saint who started it all. After the confrontation concludes, Alphina decides to settle down and checks on Carl at his school. She infiltrates the academy disguised as a teacher, only to uncover a plot by a religious cult targeting a student who bears a grudge against her family. Her meddling blows her cover, leading to her recapture by the royal family who are determined to force her into a marriage she desperately wants to avoid.