Boukoku no Marguerite

When the Kingdom of Lunaria was destroyed, the young princess Marguerite was saved by the villager Christophe of Elbe. For the next ten years, she was raised as his son Nicolas to hide her true identity. Until one day, she saved the traveling goldsmiths Rene and Leo from bandits. A European-style romance between a boy and a girl with painful pasts!

(Source: Akitashoten, translated)