From Decadence:

Spring of 1921 in the Taisho era, Ichijo Maria had lost her parents and entrusted herself to a friend's family. She leaves the house when the father became physical with her. Maria wanders the town and collapses in front of her old house. She is saved by a young doctor called Toudou Sei. There, she learns the house is currently being used as a dorm by the doctors of Imperial Maria Hospital. Remembering her fathers words, "I was tricked by Toudou!" she works there as a maid under a fake alias in order to reach the truth...

From etc:

Ryo thinks she is a normal girl living a normal high school life in modern day Tokyo. But is she? On a school trip, a mysterious man attacks her and claims that he is Benkei, the legendary warrior monk who collected 999 of his opponents' swords in battle during the Heinan era. And he also claims that she is Ushiwakamura, the 1000th opponent, that according to folklore, beat Benkei and became his master. But...Ushiwakamura was a man! And Benkei and Ushiwakamura existed in 13th century feudal Japan!

This is a very cute story about Hitomi, an elementary school student who's always mistaken as being older when she's only a fifth grader. She falls innocently in love with a highschool guy working at a pet shop, Takeru, and tries to pass off as an adult so he can fall in love with her...but of course, nothing goes as planned! ^o^

From Nekohana: A historical shoujo about Spain and Japan. Maria lives a quiet peaceful life in Spain except for the constant affections of Antonio, but fate changes when Maria trips onto Koujirou, a samurai.

From Viz:

Poor Sumi Kitamura… Her irresponsible older brother Eisuke keeps bringing home orphans for her to take care of even though they can barely afford their own basic needs! Just when Sumi's financial problems become dire, wealthy Soichiro Ashida enters her life with a bizarre proposition: he'll provide her with the money she so desperately needs if she agrees to marry him. But can Sumi fool high society into thinking she's a proper lady? Moreover, is it worth giving up everything for this sham of a marriage?

From Ultimate Manga guide:

Ibuki Morisato dreamed of kissing a prince turned into reality when her dream prince appeared as the new transfer student?!

Usagi is the granddaughter of the leader of a prestigious ninja village, but she's such a klutz that she's never made it out of the lower class. Frustrated with Usagi's lack of progress, her grandfather sends her to marry Lord Hanzo with an order to breed many ninja children. But the lord has no interest in her or her childbearing potential!

Last volume includes Promise of the Moon.

From ClubManga:

Kayama Miharu enters her new middle school and immediately becomes friends with Mori Mizutama, a very cute guy she first takes to be a girl but is really a boy. However, though Miharu likes Mizutama, she cannot tell him, especially ever since the older Kawagoe (yes, a boy) seems to have taken Mizutama's interest instead. Miharu tries to be cute for Mizutama, but finds it practically impossible, as he is both more talented at home economics and more cute than herself. Then, Mizutama joins the Kawagoe's soccer club instead of the comedy-lovers' club the two of them had decided on earlier...

Also contains the story Fuyu Hanabi

Sakura is a child who appears simple, but has a crush on her friend's big brother. A tragedy suddenly occurs, drastically changing her life, but to a good turn! A magical item appears to give our heroine the chance of her lifetime by turning her into an adult. But alas, how long can her fantasy last and how will it proceed on from there...?

The Sakura household is a household which has since ancient times worked as sake brewers. One day the daughter of the household finds a katana in her family's warehouse and when she unsheathes it, the sword starts to shine. The title Sakura Juuyuushi is a play on words of Sanada Sakura Juuyuushi, a story of the group of 10 ninja who assisted the warlord Sanada Yukimura during the Warring States era of Japan.