From Hoshikuzuu Scans:

The story of a young owner of a long-standing small eatery and a puppy-like laborer.

Kota attaches himself like a puppy to Makoto, who has been like a fatherly figure to him. Even after they have grown up, he still smiles and proclaims proudly that “Mako-san’s food tastes just like a mother’s does!”

The two get along as well as a family, but one day, a customer arrives who becomes a thorn in Kota’s side. The two appear friendly and Makoto shows expressions that Kota has never seen him make. And he acts differently than normal… Kota is then plagued with a dislike and worry that he can’t shake off.

From Divine Sanctuary & Midnight Scans:
The Senpai that I liked so much had a girl he loved. No matter how hard I tried, I was second place in his heart. That’s when I started to go out with my classmate, Haru, who was also having one-sided feelings. We started going out to empathize and sympathize each other’s feelings but slowly, change was starting to take place in our relationship too.

Yukito Kunisaki is a man traveling Japan in search of the "girl in the sky". Eventually he makes his way to a sleepy seaside town, where he meets a strange girl named Misuzu Kamio who has dreams of flying in the sky. During his stay in the town, Yukito meets other unique people and begins to learn more about Misuzu and the town she lives in.

Itsuki Minami needs no introduction – everybody’s heard of the “Babyface” of the Eastside. He’s the toughest kid at Higashi Junior High School, easy on the eyes but dangerously tough when he needs to be. Plus, Itsuki lives with the mysterious and sexy Noyamano sisters. Life is never dull, but it becomes dangerous when Itsuki leads his school to victory over some vindictive Westside punks with gangster connections. Now he stands to lose his school, his friends, and everything he cares about. But in his darkest hour, the Noyamano girls come to Itsuki’s aid. They can teach him a powerful skill that will save their school from the gangsters’ siege and introduce Itsuki to a thrilling and terrifying new world.

Note: Won the 2006 Kodansha Manga Award in the shōnen category. A new edition named Air Gear Unlimited was released in 2014. The format is bigger and it contains some coloured pages.

From Chibi Manga & Shoujo Crusade:

1-3) Air Koi
Nina has one sided feelings for Hayashino Senpai. Nina is unable to see Senpai until she clears the game that Senpai provided…That is…to find and take the exact pictures that were e-mailed to her. But Taro from the same class was assisting her And realized how odd this game is and…?!
A Painful dramatic love story!

4) Lost in a First Love

5) Love Materializes

By day, highschool girl Aikawa Maki is a normal girl who has fun with her classmates Yuu, Michiru, Renge and Mina. By night however, where streetfights take place, she becomes an unrivaled lethal air-borne attacks user with a succession of victories: Airmaster. Various strong people, fascinated by this girl's strength, will come to challenge her in battle...this vivid street-fighting comic starts here!!!

A journey to find the power of the lost Queen. Their great adventure begins.

Reimi is your poor middle school girl who yearned to meet a rich guy and marry off rich. Meet Airin, a strange girl who so happens to be rich, but doesn't even look or act like it! Watch as Reimi and Airin turn each other's world upside down! Welcome to a world filled with cuteness, craziness, and comedy!

Koga is enchanted by Aki, a mysterious and handsome coworker who is always helping her out at her part time job. But what she doesn't know is, Aki has a secret... He can't drink anything but tears?!

From Fantasyshrine:

In the all-boys school, Blooming Love Academy, there's a super-elite group where gorgeous guys flock in unrestrained abundance, the GLG (Gorgeous-Looking Guys). Even the people off-campus have heard of them. One fateful day during the preparation of the school's Christmas party, Echizen Makoto encounters the tall, handsome Fujimiya. Will the ordinary-looking Makoto ever have a chance to make his wish come true!?

1-4) Aisanai Otoko
Sahara works in publishing with Yagisawa Kei. After vowing he won't get involved with straight men again after heartbreak, Sahara meets Seto who is a designer at a firm his company collaborates with. Seto begins to pursue Sahara, but what will happen when Sahara learns that Seto isn't gay?

5) Snow Tale
When Hiromu picks up Kouta half frozen in the snow, he never thought it'd lead to a relationship. When a crazy ex-boyfriend shows up, ready to attack, what will happen to the new couple?
(Also included in Make Me Happy)

6) Extra - The man who wants to know

N/A

It's while he was waiting for a girl in the street that Aikawa-san ran into a sweet-looking boy named Okakaneko Toshinori called Neko for short. The young man just got injured while saving a cat and he asked Aikawa-san to bring him to the hospital, leaving pretty much everything to the man's care. Three days later, Toshinori calls him and asks for his help again...

Every day, Asahi goes to school depressed. This changes one day when he meets a girl on the rooftop. But there seems to be more to this mysterious girl than she lets on...
p/s: Yandere girl :v

From Yaoi Toshokan:
Clean freak Mochida meets his match with his classmate in the same major, Mutou. Oblivious to everything, he clings onto Mochida and doesn’t take care of the things Mochida lends him. On top of that, he gives Mochida a porno as a thank-you gift! Like a big dog, he goes all out and doesn’t know how to read the mood, joking all the time. But after a certain incident, he stops touching Mochida. But he’s not lonely! Right!? With a mischievous dog and a clean-freak, where is this road of love taking them?

Izaki always did well in life, no matter it was school or tennis. Nothing was handed to him; all was gained through effort and diligence. Because of his straightforward nature, he tended to clash with others. That was the way he knew and he extended his belief not only to himself but also the people around him. He was satisfied with his modest achievements, that is until he met the true genius, Hakamada...

Hakamada, the quiet prodigy insomuch as things just come easily to him. He doesn't have to work or study hard, and manages to come out on top which is frustrating for Izaki who realizes he'll never reach that level no matter how hard he tries.

At the school reunion after 8 years, Izaki finds himself drinking like old friends with his self proclaimed rival. Before he can even make sense of the strange situation, he found himself in a strange bed...

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Djs:

1.Aisarechattano / アイサレチャッタノ (2004)

2.Ai no Tameni / 愛のために (2005)

It started because he was cool.
It's almost two years since we dated. Am I supporting you properly?

1-3, 6) Aishi no Sweet Voice
A young boy who has always hated his girlish voice meets a striking man with a captivating voice. They try to figure out their feelings while striving to realize their dreams in theater.

4-5) An Unopened Door called Honey Moon
Takahara is a rich heir, popular guy that many girls desire, but for Satori, who raised him, Is just big spoiled brat. Could Takahara ever win Satori's heart?

1) Yurusarenai Otoko

2) Aishiatteru Futari

3) Seigi no Mikata no Koi no Yukue (Love & Battle)
Seigo, who grew up in a village, moved to Tokyo to find a job and to fight crime (apparently he has some strange superpowers), since not much happens in his village. One day his childhood friend Touma visits him and challenges him to remind him of his mission. At least that's Touma's claim...

4) Kanoko's Story

Note: Chapters 1-3 are shounen ai stories while chapter 4 is shoujo.

1) Two boys stay at the same dorm and seem to be fighting every day... but do they really dislike each other?

2) A boy refuses his kohai's confession saying he only goes out with experienced people. But somehow he still cannot resist...

3) The new in-game at class is chocolate roulette - including chocolate which has the effect of aphrodisiac and whoever draws it, gets to sleep with the popular boy. Same story, Mix Mix Chocolate chapter 1.

4) A very popular student uses his classmate to evade his a clingly girl by telling her "This is the person I like!"

5) At a school festival, a boy is embarrassed because the guy he shares a secret memory with is hosting the show that puts him up for an auction - whoever bids highest gets to spend the day with him.

6) (Shotacon) A tedious rich boy relieves his boredom by playing with his servant.

7) A student was practicing the piano when all the sudden he gets kissed and blindfolded...