"Rose Guns Days Sorrowful Cross Knife" is a manga adaptation of the visual novel series "Rose Guns Days" by 07th Expansion. Set in a post-World War II alternate history, the story unfolds in a fictional Japan occupied by foreign powers. The narrative centers on a divided society where the Japanese population is marginalized, and foreign elites dominate the political and social landscape. The story explores themes of resistance, survival, and the moral complexities of war and occupation.

The protagonist, Leo Shishigami, is a former soldier who becomes embroiled in the struggle against the oppressive regime. After losing his family in the war, Leo seeks a quiet life but is drawn into the conflict when he encounters a group of resistance fighters. Among them is Rose Haibara, a skilled and determined leader of the resistance, and Guns Starling, a mysterious and resourceful woman with a tragic past. Together, they form an uneasy alliance to challenge the occupying forces and fight for the liberation of their homeland.

The plot delves into the intricate dynamics between the resistance and the occupying powers, as well as the internal conflicts within the resistance itself. The story examines the personal sacrifices and moral dilemmas faced by the characters as they navigate a world where loyalty, trust, and justice are constantly tested. Key antagonists include members of the foreign elite and their collaborators, who wield power ruthlessly to maintain control over the population.

As the narrative progresses, the characters' backstories are revealed, shedding light on their motivations and the events that shaped their lives. The manga explores the psychological toll of war and occupation, portraying the characters' struggles with guilt, loss, and the desire for redemption. The action is interspersed with moments of introspection, highlighting the human cost of conflict and the resilience of those who fight for a better future.

The manga maintains a balance between intense action sequences and character-driven drama, creating a compelling narrative that keeps readers engaged. The artwork effectively captures the gritty atmosphere of the setting, emphasizing the tension and desperation of the characters' circumstances. "Rose Guns Days Sorrowful Cross Knife" offers a thought-provoking exploration of resistance and survival in a world where the lines between right and wrong are often blurred.