"Beatrice used her family's influence to impose herself as my fiance. It's not what I wanted." Beatrice is the daughter of an influential Duke in the Kingdom, and has just overheard some of the girls saying that her intended, Prince Ernest, said those exact words. Beatrice has been despised by others in the academy for her relationship with the popular Prince Ernest but is determined to turn that around and live the way she wants to live! "I've been so occupied with trying to please Prince Ernest, I've never taken the time to get to know those around me. What have I been doing all this time?" However, when she starts to get to make some friends, talk to some handsome gentlemen, and finally enjoy her life at the academy... her salty fiance seems to become more and more assertive...! (Source: MangaPlaza)

A slightly more upbeat look at the "my ex is getting married" story.

From Dark Horse: The Apocalypse didn't end with a BANG, but with a whimper. Silently, the "amnesia wind" swept away all of mankind's knowledge. Thousands of years of human civilization vanished overnight as people forgot how to use the tools of modern civilization; who they were--how to speak--everything. Technology decayed as mankind was reduced to an extremely primitive level. Two years after the devastation, a young man explores a nation reduced to barbarism: America. Miraculously re-educated after the cataclysm, a young man is accompanied by a strange woman--somehow spared the obliterating effects of the amnesia wind. Pursued by a relentless killing machine, they search for those responsible for stealing their memories.

It's not something you can simply teach. The desire to save your friends??? That alone is enough. "But first, you must regain all the strength you have lost." Sora has lost much of the strength he had gained when he traveled into the Sleeping Worlds for the Mark of Master Exam. The great wizard Yen Sid tasks Sora to go on a journey to perfect the Power of Waking. In order to stop Xehanort's grand scheme, Sora, Donald and Goofy's new journey begins! The conclusion of the Dark Seeker Saga, KINGDOM HEARTS III begins!

*Kinuroku* follows the adventures of a cyborg named Roku and a Martian named Kinu.

A completely original story of Kuma Kuma Kuma Bear. An exciting tale of featuring Yuna, a bear girl dressed in overpowered and cute bear equipment! While living free-spirited in another world, there are incidents that make Yuna want to rest. An original story that no one knows yet begins with delicious food in hand ♪ During their stay in the royal capital, Yuna and Fina hear rumors of a phantom thief who'd been stealing jewels from nobles and then returning them. They travel to see one of the phantom thief's latest robbery's when...? "Phantom Thief of the Royal Capital" Chapter start!

Prince Callus Leditzweissen is a Taboo Being, an unfortunate soul born with a deadly curse that causes him constant suffering. With no known cure, the doctors say Callus only has six months left to live. But a magician named Gourley gives the boy a sliver of hope when he demonstrates the healing power of light magic. Callus is determined to learn how to use light magic in time to save himself, hoping to live longer to repay all the kindness he’s been shown throughout his life. *Source: J-Novel Club, Vol. 1*

Robin lost her older brother Simon in a car accident, and a woman driving in the opposite lane was also killed. That woman's brother, Cesare, assumes that Simon was completely at fault for the accident and plans a clever, ruthless revenge: he uses his overwhelming economic power to force Robin into marrying him! Robin tries to fight the forced matrimony, but when that epitome of manliness Cesare pulls her into a rough kiss, all her strength leaves her body... (Source: Renta!)

Average young girl Kazuki Suou lived a peaceful life with older brother Masaki. That is, until she met Shirou Kusanagi, a boy with secret knowledge of her past, and the dark contract Kazuki was a part of in a former life. (Source: Cinderella Story)

From Yen On: Long, long ago, when all the worlds were still one, there was a place called Daybreak Town. Here, under the leadership of the Foretellers, Keyblade wielders spent their days collecting light for their Unions-and you were no exception, fighting the darkness alongside your pal Chirithy (that's me). But then, one day, you made an unusual new friend who warned you there was more to this world than met the eye. Meanwhile, conflict was building among the Foretellers and Unions, one that threatened everyone's future-including yours. Based on the spin-off video game, Kingdom Hearts χ / Union χ.