Wellber no Monogatari: Sisters of Wellber

Thief Tina Lothar came to steal a golden statue, but what she got instead was a princess. Royal Rita was arranged to be married to the prince of a rival kingdom in order to avert a war that would crush the country of Wellber, but after being forced at knifepoint to perform unsavory acts, Rita stabbed her husband-to-be and fled with her newfound-ally Tina. The king of the rival kingdom demanded a public execution of Rita within a time limit or face their cannons of war; so the duo, along with the AI tank Count Gyrano de Borgerac, now set forth to the neutral country of Greedom with a petition that may stop the war. Tina is acting as Rita's bodyguard and has reasons of her own for traveling to Greedom: the man who murdered her parents has been spotted along the way. With a bounty on Rita's head and danger at every turn, the pair must do everything in their power to reach Greedom alive.