Collection of short stories.

Doraemon, a cat shaped robot which came from the 22nd century in the future, goes back in time in order to help Nobita, a below average lazy kid, to make his life less miserable and improve his descendent's life. With many of Doreamon's gadgets from the future, Nobita's life will never be the same.

Note: It was awarded the first Shogakukan Manga Award for children's manga in 1982 and also won the Tezuka Osamu Cultural Grand Prize in 1997.

From MangaHelpers:
Tonight, Natsuo loses his virginity. His partner? Her name is Rui and he just met her today after school. She's the one that brought up this whole situation, stating that she wanted to simply gain the knowledge about sex. She does not want to start a relationship, nor does she care about Natsuo.
Afterwards, Natsuo feels guilty for losing his virginity to a girl he doesn't even particularly like. Mostly, it makes him feel like he betrayed his crush to his high school teacher: Hina. A quirky love triangle story unfolds as Natsuo, Rui, and Hina all end up becoming part of the same family.

Everyone on the Clockwork Planet considers Naoto Miura a machinery nut. Every moment of every day, he has his mind on gears and his hands tinkering with delicate mechanical motors, but nobody understand how he can hear and feel gears in operation, even from a long distance away. Then one day, a clockwork maiden falls from the sky, presaging events that would shake the whole world.

After Ryou's father remarries, he's not sure what to do with three new brothers and a stepmother at the age of 19. As he comes to appreciate his happy new home and family the glue holding them together starts to come undone. How will these four brothers weather tragedy after tragedy and stay together?

Japan is now the 51st state of the U.S.A..
The isle of Neon, located near Japan, is the only place where prostitution and gambling are legal. There, Italian Mafia, Chinese Triad and Yakuza fight each other to gain the control of casinos and brothels.

Iori Shijima, an ordinary high school student blessed with a good, common life. He has a cute childhood friend, lots of friends he can rely on, and a nice and beautiful mother. Additionally, his grades are good and he has a solid future plan. However, one day "transcendent beings" called ĀTRAIL appear on Earth, and Iori's everyday live crumbles as he learns about the secrets of another world and the meaning to his own existence.

The accompanying 4koma for Accel World.

From Yen Press:
No matter how much the times change, bullied kids aren’t going anywhere. And fat junior high school student Haruyuki is one of them. But one day, Haruyuki encounters Kuroyukihime, the most beautiful and elegant girl at school, who gives him a mysterious program: “Brain Burst”…and the secret of the “Accelerated World.” He may be at the bottom of the food chain at school, but Haruyuki and his destiny begin to “accelerate” with incredible speed in the virtual realm as he aims for the top.

There is an inn that you can visit where you'll find old things you thought were lost forever.

From The Zero Alliance:

Asagi is an exorcist with a tragic past.
One day, an encounter with a certain ayakashi causes him to recall that tragic past…

A collection of stories:

1. Toshokan no Hime-chan (The Princess of the Library)

6. Nakimushi Ouji-sama (The Crybaby Prince)

From Canis Major Scanlations:

When the President got into an accident, Shirotani Tadaomi met Kurose. On their very first meeting, Kurose could tell right away that Shirotani is Mysophobic and said that it's pretty bad while suggesting it would be better to consult a doctor about it. Shirotani was left perturbed by the encounter. Who is Kurose? And how was he able to tell Shirotani's condition?

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"Mirror" - Artbook

Shirashi Kouta both handsome and smart. As the prince of the school, there should be no girl who can resist his charms, even if it's the cool beauty Kurokawa Kaori. But what happens when it turns out Kurokawa is even better at playing a prince than he is? Just who exactly is supposed to be falling for whom?

Follow the story of a boy trying to fly and a girl trying to rebuild a tower.
Together, they traverse a post-apocalyptic world.

-Full-color manga-

A collection of stories:

From Lililicious:

1. Cosmos no Saku Niwa (The Cosmos Garden)

2. Goshujin-sama to Issho (Together with Master)
A "PET" is a love animal, created for the express purpose of pleasing their master. This is a short story of how one PET became endeared to her master, and vice versa.

3. Kuchinashi (Gardenia)

4. Sakura Buntsuu (The Cherry Tree Correspondence)
A sweet story set in the Taisho period.

5. Hare ni Mau Yuki (Snowflakes Fluttering Down Through the Clear Sky)
A love story about a princess and a knight.

6. Hoshi ni Negai o (Wishing on a Star)
Two friends deal with grief.

7. Sakura Buntsuu - After Story (The Cherry Tree Correspondence - After Story)
Another pair of girls begins exchanging letters.

When Miyanaga Saki was a child, she would always lose her New Year’s money during her family's mahjong games. If she won, her family would be upset, and if she lost, well, she lost. As a result, she’s learned to play in such a way that her score always remains plus/minus zero: not good enough to finish first, but not bad enough to finish last.

Now a high school student, Saki dislikes mahjong and avoids it. Until one day a friend drags her to the school's mahjong club, where her hands touch the tiles once again...

‘Race!On!’ is a high-octane action/racing manga which pulls you into the fantasy land of Oracen, where magic and steam-driven technology co-exist. There are magical creatures, robots, monsters, and crazy people who wear pointy hats. The story follows Lyn – a mechanic who, by a twist of fate, finds himself entering a Magic Race – a dangerous competition where the objective is not only to outrun your opponents, but also to survive whatever explosives, magics and punches they might throw at you. In this crazy competition where anything can happen – you either finish first, or you don’t finish at all.

From Impossibility:

This is the story of four high-school students whose family name happens to be Kobayashi that end up in the same class. No Kobayashi is similar to another Kobayashi and in fact, three of them are considered something similar to the Bermuda triangle. Anybody who gets near, ends up... well... that's better left unsaid.

New student Kobayashi Yamato is not afraid however, and already considers them like brothers and sister! Will his naive youthfulness be crushed forever? Will the everlasting power of "always happy attitude" overpower the famous trio? Will anybody survive the year?

Are you a victim of unwanted spirit possession? Is there a ghost you need sent up and away...or down to burn for all eternity? If the answer is yes, then you need Muhyo and Rouji, experts in magic law. Serving justice to evil spirits is their speciality.