3.863 out of 5 from 15 votes
Amira Hergal is a twenty year old woman who has travelled across the mountains near the Caspian sea in order to wed Karluk Ayhan, a young boy eight years her junior. Despite being far from her own village, Amira is a hard working girl who is eager to please and happily adapting to life in her new home. Now she lives a peaceful life with her new family, from going to meet Karluk’s nomadic uncle and baking bread to amazing the villagers with her archery skills. But when her old family decides to reclaim Amira and have her marry another man who will be more beneficial to the village, it seems her happy life with Karluk could be at an end...
Both series sport an older girl being married to a younger guy and in both series the girl has a little trouble figuring out her relationship with him (due to his young age). The difference is, the duo from Otoyome-gatari get along pretty well, while the main characters from Soredemo Sekai wa Utsukushii don't (at least not on the surface).
Both series have a rich kid paired up with an older girl. While the romance does unfold in both of them eventually, the girl has to act more like an older sister than a lover due to the guy's young age. The age gap is greater in Dear Mine, but the duo there seems to get along better. If you liked one of the series it is very likely you'll dig the other one too.
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.
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 shoujo manga feature a kid prince being paired up with an older girl and in all honesty this should be more then enough for you to decide whether to read one of them or not if you already read the other.
P.S. I find Soredemo Sekai wa Utsukushii to be the better one of those two.