In the Ai to Inbou no Oukyuu series:

In Verdonia, the king is elected through a popular vote among the eldest royals from the three principalities, Celestia Verdon and Avernos. With the throne of Verdonia at stake, marriage becomes just another strategy for securing the crown...

WHERE'S THE ROYAL BRIDE?

Minutes before walking down the aisle, Princess Alyssa Sutherland from Celestia, vanished into thin air. Rumor has it that the lady in question wasn't marrying for love. Did Her Highness catch a case of cold feet? Perhaps a certain oh-so-uninvited guest crashed the party. Sources say Merrick Montgomery was spotted on the scene...and gossipmongers are buzzing with tales of a secret elopement. Did the dangerously sexy rebel kidnap the princess for political gain? Or did he simply sweep our royal beauty off her feet?

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V.1 - Mezametara Princess

In her youth, the mother of Alyssa Sutherland fall in love with the prince of Celestia, the middle principality of Verdonia, but they are forced to separate.

In the second part of the volume, another love story in Verdonia.

V.2 - Wedding wa Namida Iro

This story explains how Prince Brandt von Folke from Avernos, the northernmost principality of Verdonia, while trying to force princess Alyssa Sutherland into marriage, end up marrying unknowingly Miri Montgomery.