After an accidental mishap awakens her memories of a past life, Lentinel discovers that she was raised as the family's fourth son!
Actually a girl, yet forced to get caught up in a family power struggle, Lentinel is utterly bewildered to discover that in this world of swords and magic, she's a complete good-for-nothing.
But first things first: she discovers that, before her memories awakened, she publicly broke off her engagement to the daughter of the emperor.
Comforting the princess, recruiting allies, expanding her influence, and standing against her elder brothers: that's her starting line in this world.