A cyberpunk-ish spin on the legendary hero, Momotarou.

From Wild*Hope:

Miyako, who has undergone strict training, is the heiress of a rich family. However, the person she loves is her distant cousin Chiaki, who is her complete opposite. Miyako's mother has always been opposed to their relationship and arranges an omiai for her. Just when Miyako prepares to elope with Chiaki, she finds out that he has already left...?

From ShoujoMagic:
Shinjo Mayu's newest leading lady is an idol, and the leading man is... a future prime minister!? Just what is a "Love Celeb"? Nakazono Kirara is an aspiring starlet. She used to think she'd do whatever it took to get a starring role in a drama and have a CD. But her manager, Hanamaki, proves her wrong when he sends her into a room full of horny producers to sleep her way into a role! Kirara wants no part of it! She's a virgin, and these guys are scary!! Especially the silver-haired one named Gin... He seems to be in charge. But he lets Kirara leave the party with her virginity and his phone number, and it seems like nothing lost, nothing gained... until Kirara is suddenly the most famous new starlet for no apparent reason!?

Side story in volume 7: Darenimo Ienai!
Ruka’s a junior high student in love with her father’s assistant, Fumi-sempai. She wants to become an adult quickly because everyone sees her as a little kid! But what would happen if she actually became an adult with the help of a time machine?

In a small village, there is a legend about a person born from a sakura tree one thousand years ago. Though she appeared human in form, she could not understand love, and was therefore cruel. She was eventually destroyed. Now, the mythical Sakura tree is going to attempt to create human life once again. This time it is up to two high school students, the incredibly beautiful Tasuku and the love-allergic girl Honomi, to teach the Sakura Child about love.

Kane Blueriver and Canal, his AI companion, are trouble contractors who take jobs which require their special skills. This could go from armed escort, to patrol, to capturing dangerous criminals. Milly is a private eye who has to be the best at everything (uchuu ichi!!). When the three of them get together, they run into one mess after another, gradually uncovering more of a mystery that ties the legendary Lost Ships to all of their pasts, bringing them closer and closer to a discovery that something called Nightmare would rather not have them find...

Utsuru Sanada is a professional photographer at the age of 17, he can guess the exact 3 sizes of any girl, he can memorize anything he sees, and he can counterattack karate moves (most guys would want these abilities). Why? Because he has superb photographic memory called “Shutter Eye”. He meets Niko Kurihara, the female protagonist, who dislikes men, is a master of martial arts, and is of course beautiful. Utsuru attempts to prove to Niko that he is not the guy she thinks he is so that he can take a picture of her. He starts by investigating Niko’s friend’s date, who appears to be a deceptive guy according to rumors…

Ran as a one-shot in 2009; started serialization in 2010.

From Prisms:

A romantic comedy about Fuwa, a guy living in a small apartment in overcrowded Tokyo, who wants to have a place of his own. Because of a building accident in their new office building, Fuwa's company (5 employees) had to move into his apartment, right after he had moved to a larger place. And the new employee (Hiyama Izumi, a 15 year-old girl) had to move into Fuwa's place, as she had just come from the country. Then Fuwa's old girlfriend Tokiko, who had already gotten married, ran away from her husband and came to Fuwa's place.

Saiki Takaya, a guy who is easily misunderstood, one day finds a flask containing the succubus Lilim. She is very attractive but, she also has the tendency to drain the life force out of people. She surprises the life out of him (literally) when she kisses him unconscious. Lilim then flies off for more "food," but returns later, saying that Takaya's life-energy was the "tastiest." From then, Lilim is accepted by Takaya's parents as a live-in girlfriend of sorts, and Takaya's heart seems to start wavering towards this voluptuous devil.

This is Daikichi Kamiyama. A College Student at Toudai University. He had came back to his home town to attend such a prestigious University. He happened upon a cafe where once stood a great wrestling arena lead by the "Amazoness kitty." Now three daughters remain running it. Yukihyou (Who has taken a sudden interest in him.) Ferris (A rather ditzy young woman.) And Leona (A Tsundere-ish big boobed girl with a rather "Unique" Ability in the wrestling ring.) Join Daikichi "sandbag" Kamiyama as he endures the trials ahead of him with these Bombshells.

From: Easy Going Scans

Fantasy Action Legend that follows brother's diary!!
After his brother Loki's death, on Tyr's 17th birthday.... Loki's diary is delivered to Tyr. When following the diary step by step, Tyr realizes that everything that's happening around him is already recorded within the diary.

From RebelliousArt:
Asahi, desperate after the loss of her best friend and boyfriend, came to the abandoned elementary school above the hill. It has been said that it's a cursed place that it will be the last place you will tread in. Those who live will not be able to return. And there, Asahi meets...!?

A series of oneshots.

Sana Kurata, a child actress, faces many problems in her classroom, including a major one - her bullying classmate, Akito Hayama. Sana's outgoing and friendly nature leads her to work towards correcting all of the problems around her. Her 'meddling' irritates Hayama but at the same time captivates him, just as Hayama's gloomy nature irritates Sana and compels her to change him. As these two opposites attract each other, they face many hardships which bring them closer to a mutual understanding.

This manga won the 1998 Kodansha Manga Award for shōjo.

Daisuke is a 23 year-old new schoolteacher. He ends up being put in charge of a 3rd grade elementary school class since the previous teacher quit, and in that class there's a girl who's quite a troublemaker--Rin Kokonoe. You could call her a masegaki (used to describe a kid that acts more like an adult in some ways), and she's also part tsundere (though more dere than tsun).

Peace seemed to have finally found its way into the Obinata household, but through an unexpected turn of events, Shuu and his adopted son, Yuuta, are faced with a disagreement that might change their forever. When their respective lovers, the eldest Obinata brother Taiga and Mayumi, the youngest, are dragged into their conflict, and Yuuta runs away from home, the whole family's living arrangement gets off balance. Will the peaceful days ever return?

Mainichi Seiten series:
Vol 1-2 Mainichi Seiten
Vol 3-4 Kodomo wa Tomaranai
Vol 5 Children's Time
Vol 6-7 Kodomo no Iibun
----Aki-chan no Iibun
Vol 8 Isoganaide
Vol 9-10 Hanaya no Nikai de

From Del Rey:

Najika is a great cook and likes to make meals for the people she loves. But something is missing from her life. When she was a child, she met a boy who touched her heart–and now Najika is determined to find him. The only clue she has is a silver spoon that leads her to the prestigious Seika Academy. At Seika she meets two brothers Daichi and Sora, could one of them be the boy from her childhood?

Won the Kodansha Manga Award for Children's Manga in 2006.

Rinne Ikaruga is just your average 16 year old girl, trying her best to get by. One day, she receives a package addressed from her sister, inside of which is a little girl who just happens to be part planarian and can multiply.
A planarian is a kind of non-parasitic flatworm organism.

Pilot for D. Gray-Man.(http://mangapark.com/search?q=dgray-man)

Fujita is a second year middle school student with a face as pretty as a girl's. On top of that he's whimpy and a bit of a crybaby so he's often confused for a girl. Echo-chan is a fairy who promises to grant his wish and turn him into a strong and attractive man capable of sweeping Onigasaki, his unrequited love, off her feet if he agrees to help her.

From Karma Falls Scanslations:

Because of a frightening experience three years ago, the boy Sata Senda became a compulsive cleanliness freak. As he has anti-bacterial spray and mask as standard equipment and doesn’t allow any form of close contact, he has no friends… Thus came the summer of sixth grade. Sata, who has been half forced to participate in the school trip, arrives to the meeting place completely wrapped in a protective suit?!

From Transcendence:
High school student Asahi is forced to provide blood to a childlike vampire Hikato, and becomes his "temporary" mother, until he reverts to his original self. When Asahi finds out that Hikato stayed behind to protect the human world, how will her thoughts towards him change….!?