From Easy Going Scans:

Piano prodigy Arima Kosei dominated the competition and all child musicians knew his name. But after his mother, who was also his instructor, passed away, he had a mental breakdown while performing at a recital that resulted in him no longer being able to hear the sound of his piano even though his hearing was perfectly fine. Even two years later, Kosei hasn’t touched the piano and views the world in monotone, and without any flair or color. He was content at living out his life with his good friends Tsubaki and Watari until, one day, a girl changed everything. Miyazono Kaori is a pretty, free spirited violinist whose playing style reflects her personality. Kaori helps Kosei return to the music world and show that it should be free and mold breaking unlike the structured and rigid style Kosei was used to.

Won the Kodansha Manga Award for Shounen in 2013.

Reiji and Kasuga head out to Tokyo to become the "Gods of Rock," but they seem to always attract trouble. On their way, Hayama Ryo and Fujii Ran join them in their quest.

Welcome to Cromartie High—a melting pot of underachievers and overzealous bullies, where the fist rules, and the student body has the combined I.Q. of a rusty nail. After a whole lot of bad judgment and a little bad luck, Takashi Kamiyama is now attending this academy of dunces. Here, his only homework will be defending himself against the foul-mouthed robots, semi-intelligent apes, and masked villains that roam the halls of Cromartie High School!

Won the 26th Kodansha Manga Award for Best Shounen in 2002 (shared with Beck).

Note: The chapters are incorrectly numbered starting from Volume 14 (the volume begins with chapter 267 even though the last chapter of Volume 13 is 269).

From Shinmakoku Scanlations:

1-2) 24 Jikan Eikyou-chuu
Nakamichi works in the 24-hour convenience store on Sano's way home from school. Nakamichi is baffled by the amount of lollipops Sano buys everyday! But he gets very used to seeing Sano around, that when suddenly Sano stops showing his face at the store, he misses him! What happened to Sano? And why buy so many lollipops?

3-5) 24 Jikan Renai-chuu
Yoshino, an ordinary guy works at a convenience store where he meets the beautiful Yagami-san. He overhears Yagami-san having an argument over the phone with who he assumes is his girlfriend. What will Yoshino do when he sees Yagami drunk and collapsed outside the convenience store, and hears him whisper a guy's name in his sleep?

6-8) Extra: 24 Jikan Eikyou-chuu

Sorako and Sorao met in the school office when they both had transferred to a new school. They became friends really fast, but a short bubbly girl comes and claims she likes Sorao. What will Sorako do? A really nice love story.

Nako is a poverty-stricken 21 year-old in desperate need of a job. She applies for a job at a jewelry store. When shop owner Ren identifies herself as a lesbian, the competition for the position evaporates, leaving only Nako. Ren asks her if her sexual orientation will be a problem, Nako sensibly replies that she's not interested, so she doesn't see any problem.

From Easy Going Scans:

A gangster girl in high school decides it's time to live life properly after graduating by marrying a nice man and living a normal life. However, her past as a gangster constantly threatens to come out from time to time and she has trouble holding back. And when she has a daughter...apples don't fall far from the tree.

Smart, successful and good-looking Iwaya Sumire works for a big newspaper. However, her boss asks her to leave for being too "perfect" a woman. Feeling angry and dejected Iwaya returns home depressed, and most of all lonely. However, when she finds an unconscious young man lying in a box out the front of her home, she takes him in since he looks like a dog she used to own called Momo. She dubs him Momo and decides to "keep him as a pet." It's the start of an unexpected life together as they overcome obstacles and become quite attached to one another. But can love like this exist?

This manga won the 27th Kodansha Manga Award for shoujo in 2003 (shared with Hachimitsu to Clover).

Sequel to Memory of the Future (Mirai no Kioku) Kento is mild-mannered, straightforward and quite honestly, a bit boring. At 26 he's landed his first full-time position teaching at high school and does everything he can to make his grandparents, who took him in to raise after his parents' tragic death, proud of him. Unfortunately Kento is gay... and they ~don't~ approve. Enter Akira, a ticking-time bomb with a perpetual evil smirk, a ridiculously flamboyant wardrobe and a tendency to hit on anything that moves. Akira's everything Kento isn't... including drop-dead gorgeous and mindbendingly annoying. It's almost a miracle that the two of them have been dating for over a year!! But after all that time, Akira's still keeping some secrets... secrets that aren't going to reflect well on Kento's choice in a partner. Would Kento's grandparents ever survive the shock of their son dating the child of a sex-worker and an alien? Or will they, as Akira puts it, "cough up their pacemakers"?! Does Kento care more about his family's opinion of him, or his high-maitanance lover's deep-seated social inferiority complex? An extremely sweet (and funny) story of two people who couldn't be more different, or more perfect for each other. (from doki doki)

Late one night when Jun was out on his bike, he came across a drunk, half-naked girl sprawled on the side of the road. She came to just enough to be uncomfortably affectionate, but Jun took her to his home to sleep it off with gentlemanly discretion. It turns out that she is Kawase Narumi, his author mother's new assistant. Unfortunately, she has no idea what she's doing in her new job, so Jun's going to have to coach her. He's also going to have to deal with her habit of getting drunk, mostly naked, and cuddly. Jun's life will never be the same! [From Baka-Updates]

1) The Turquoise Morning
A well known photographer named Jed Knox acquires a one-sided love from his time in a foreign country. Because the target of his crush, Sahab, said he would never love another since his wife died, Jed would never tell of his feelings. Oh but how Jed wished Sahab would love him even a little bit and that he could have Sahab's soul in his hands. Although ifrits (genies, etc) are magical wish givers in story, what could happen if they were real?

2) It's Time for Goodbye
It is the morning after and the student finally notices that the lover's room is exceptionally sparse.

3) LOVE-ING
A guy tells his friend that he's gay and in love with him, but his friend is surprised and leaves.

4) Playboy!
He has had it. His lover won't make love to him and refuses to stop seeing other women.

5) The Eyes of the Rose are Bombs
The prince-like Hansumi has an effect on everyone around him, except Mitsuda.

6) Aah Boyfriend
Suzuki can't stop fantasizing about his friend.

7) Garden of Despair
Isuka is still trying to come to terms with his feelings for his friend.

8) The Eyes of the Rose are Blind
Continuation of chapter 5.

9) Garden of Desire
Continuation of chapter 7.

10) Bad Boy
Continuation of chapter 4.

11) Go Go Boyfriend
Continuation of chapter 6.

12) Postscript

Goto Nagi has travelled to the southern island of Okitsushima, and ventures out to see Umi no Misaki, a striking cape jutting out into the ocean. But when he arrives, he finds that there is much more to this cape than a wondrous view. There is something peculiar about the cape, and about the island's inhabitants.

Read some slice of Asuka-chan's normal life. And see how interesting some daily activites of a cute high schooler girl can be.

This is a story about two friends, from nearly the beginning to almost the end of their lives, who happen to love each other.

Tatsuya and Junichi are in 5th grade and their music teacher is a pedophile. One day the music teacher has a request for Yumi, a girl who uses him to get expensive gifts. He wants her to get Tatsuya into the music room so he can be with him. Junichi recently confessed his feelings for Yumi and she decides to use him as bait to get Tatsuya to go to the music room. Junichi and Tatsuya's future does not look good...

Note: Only chapter 1 of volume 1 and chapter 7 of volume 2 is shotacon. Reading chapter 1 is almost necessary for the story and is not very explicit, but chapter 7 of volume 2 is an extra/one-shot and can be skipped over completely for those who dislike shota.

A one-shot webcomic with the existence of Santa as its theme.

From Moi-xRyu Scanlations:

This spring, Tokyo TV's newly employed announcer Fukuro was given the task to gather information & do a close report on the infamous hunk of the professional baseball world; Shiratori Reiichi. Given this important opportunity Fukuro is determined to do his best! However, the following morning he wakes up to a stark naked Shiratori sleeping beside him, trouble ensues!

The demanding and selfish Shiratori with the hard working and Timid Fukuro! Watch as their love story unfolds.

In this screwball romantic comedy, Haruhi, a poor girl at a rich kids' school, is forced to repay an $80,000 debt by working for the school's swankiest, all-male club--as a boy! There, she discovers just how wealthy the six members are and how different the rich are from everybody else...

Includes 4 chapters of the story "Romantic Egoist" in various volumes, starring a pair of twins who play matchmaker with their fellow students, teachers and the like.

About the lives of the sextuplets: Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, and Todomatsu.

Note: Won the 10th Shogakukan Manga Award in 1964.

From Tokyopop:

Yume innocently uses her magic to help the people she encounters--soccer players, the wrongly incarcerated, or two young lovers wanting to see the moon on a cloudy night. And you can bet that Yume's magic leads to new adventures--and a few mishaps!