The kingdom of Adarushan is locked in a heated war with its neighbor Castoria, and prospects of victory are bleak. In order to halt the rising death toll, the king of the country negotiates a political wedding between a Castorian princess and the king's half-brother, the illegitimate Prince Alexid. And although the prince isn't pleased about being ordered to marry, he obliges due to his unerring loyalty to his king. But he is shocked by the arrival of his bride-to-be – not only is Princess Justinia only ten years old, but she pulls a knife on him! With tensions rising between the two betrothed, can they learn to get along in order to stop the ongoing bloody war?
Both manga are about the arranged marriage between the prince and the princess of two neighbouring kingdoms who do not agree with the idea of an arranged marriage, with the princess hating the prince in particular, but they don't have much choice on the matter.
Both manga are about a princess who has to marry the prince of another kingdom. However she doesn't agree with the marriage because the prince has a bad reputation so she decides to go meet him to find out if the rumours are true.
Airi has always dreamed of marrying her fated true love and living a normal, happy life – a dream disrupted forever when Aram, a prince from another world, emerges from her grandmother’s mirror. She takes the young prince home with her thinking he is a lost child, giving him a home cooked meal and a place to sleep. However, in the morning she discovers that, as the result of a magic spell, Aram transforms into a 17-year-old boy whenever it’s dark, and her kiss is the only way to change him back! If that wasn’t enough, Aram is in hiding from his older brother, the evil sorcerer Jeile, who has fallen in love with Airi and intends to make her his bride! Will Airi ever be able to find her happily-ever-after?
Both of those manga are princess x prince shoujo romance series and both are rather on the cute side. What's more, both have remarkable good art, which is kind of rare among shoujo manga. To sum it up, reading one if you liked the other is probably a good idea.