Korashimete Sashiagemasu! Otenba Oujo no Gekokujou Nikki

Lana, a skilled swordsman and academically gifted princess, is concerned about her kingdom's future due to her brother Adrian's self-centered nature. As the crown prince, Adrian is next in line to rule Mitronia, but Lana believes she would be a better leader. Since the law only allows male heirs to inherit the throne, she proposes an alternative to her father, the king. He challenges her to resolve three noble family issues to earn his support. Determined, Lana begins her journey with the help of four companions, including her childhood friend and knight, Kaiser.