"Reincarnated Villainess Won't Seek Revenge" centers on Rosemary, a noblewoman falsely accused of treason and executed in her previous life. After her death, she is reincarnated as Rize, a commoner with memories of her past life intact. Despite the betrayal and suffering she endured, Rize chooses not to pursue vengeance against those who wronged her. Instead, she resolves to live a peaceful and fulfilling life, distancing herself from the political intrigue and power struggles of her former existence.

The narrative explores Rize's journey as she navigates her new life, using her knowledge and skills from her past to build a modest but content existence. Her decision to avoid revenge is tested when she encounters individuals from her previous life, including her former fiancé, Prince Reynard, and her childhood friend, Albert. Both men are haunted by guilt over her unjust execution and seek to make amends, though Rize remains steadfast in her refusal to engage with the past.

The story delves into themes of forgiveness, resilience, and the pursuit of inner peace. Rize's character is defined by her strength and compassion, as she focuses on helping others and finding joy in simple pleasures rather than dwelling on past grievances. The manga balances moments of introspection with lighthearted interactions, particularly as Rize forms new relationships and bonds with those around her.

As the plot progresses, Rize's past continues to intersect with her present, forcing her to confront unresolved emotions and the lingering consequences of her former life. However, her commitment to moving forward without bitterness remains a central pillar of the narrative. The series offers a nuanced exploration of redemption and personal growth, emphasizing the importance of self-determination and the power of choosing one's own path.