In a feudal Japan marked by oppression and cruelty, a young nun named Seki finds herself trapped in a world of intrigue and vengeance. She has been confined to a convent, where her life revolves around prayer and discipline, but her past haunts her: she is the daughter of a murdered nobleman, and her family has been stripped of their lands and honor. One day, the convent is shaken by the arrival of a group of warriors searching for a traitor who has betrayed their clan.
Driven by the desire to seek justice for her family, Seki decides to take matters into her own hands. As violence erupts in the tranquil life of the convent, she joins her fellow nuns to confront the attackers. However, during this struggle, Seki discovers that there are hidden secrets within the walls of the convent that endanger not only her mission but also her own life.
Conflicts of loyalty, betrayal, and the weight of the past intertwine in this story of redemption and struggle, where the nuns must face their inner demons and external antagonists. The tension rises as Seki embarks on a journey of self-discovery, revealing her true potential. Action and drama combine in an intense narrative that explores the power of revenge and the strength of friendship in times of adversity.