Kagami no Kuni no Himegimi

Two girls with the same face, the same voice, the same height. Lizlotte, the princess of a small and poor country, was one of them. Then, one day, one of the princesses abruptly ran away from home. A few days earlier, she claimed to have been invited to a party in a neighboring country. The other princess decided to go to the party on her behalf. [Translated from BOOTH]