Qi Yuzhen accidentally discovered a book called "The Great Cause of Restoration", and was fooled by the cannon fodder female partner who had the same name as her in it. When she saw the cannon fodder female partner being given a chance to die by the male protagonist, she was so happy, but she felt extremely sorry for the senior sister who died with her...
When she came to another world and saw the person she cared about, she secretly swore in her heart that she would die to restore her country or something! I want to conquer the senior sister!
However, the natives of this body seem to disagree.
Purpose: Do your best for the ones you love