From Storm in Heaven:

In Keigo's school, all the troubled kids are grouped into one class -- the troublemakers, the abused kids, and the scarred ones. There's a quiet kid in his class named Asato who never talks to anyone, and like Keigo, doesn't want to go home after school. One day after class Keigo cuts himself, and the two of them discover that Asato has the ability to absorb the wounds of others. What wounds will Asato heal, and what scars does he himself carry...?

A young man, who is living alone for the first time after finding employment. At his tiny, no-bath apartment he finds a landlord who looks like a little sister. She does the cooking and housework, so sometimes seems like a grandmother, but she also enjoys a normal middle school life with her friends.

A collection of stories:

1) Kitty

2) Nagareboshi ni Kuchizuke (Kiss to the Shooting Star) -
Yawara and Chitose are childhood friends who are constantly arguing and teasing each other. Unbeknownst to Yawara, Chitose is in love with him, however she doesn't have the guts to confess. She assures herself by thinking that they live in the same appartment complex and that they will go to the same high school, which gives her all the time she needs.

However, all that changes when Yawara announces to her that he'll be going to Kura High, which is 2 hours by train, instead of the same high school as her. What if he gets a girlfriend there? What will Chitose do!?
- Raining Mangas

3) Boy Don Quixote -
Hiro moved away 5 years ago. She and her childhood friend Ri-chan had promised to meet again and that he would fullfil his dream. And now they are going to the same school. Hiro thinks they will start up where they left off, but Ri-chan is acting very cold to her.
- Bad Eggs

4) Soprano

5) Kyoukasho wo Toshitara (Textbook wo Toshitara)

From Deux:
Two Knockouts In Love!! Pretty boy Kaoru Komatsuna is self-conscious about his feminine good looks and his cute, but girly, name. Handsome school boxing champ Kubo just happens to pick up Kaoru's notebook and proceeds to make fun of his strange name. Kaoru gets angry and knocks down the champ. This inspires Kubo to desperately try to convince Kaoru into becoming a boxer. After doing his best to resist him, Kaoru finds himself falling for the relentless knockout, Kubo. This yaoi comedy packs a punch!

From ShoujoMagic:
It happened in the blink of an eye. Rikka's world turned upside down when her school field trip bus flipped and plummeted into a lake. Everyone inside that bus drowned... except for Rikka, but she wasn't saved by anything as simple as luck. When she was released from the hospital, Rikka was then attacked repeatedly in a series of bizarre incidents all involving water... and a sadistic aquatic beauty whose name is -- Rikka!? What does our heroine have that the sadistic Rikka wants back? What was it that saved her from drowning, and who gave it to her and why...?

1) Kitsune to Atori
This is a tale of human and fox, of Atori, who hates lies, and of her sister, who lost one eye because of a fox.

2) The Doll's Girl
Minori is a reserved girl who would rather be left alone to make clothing for her dolls. Kanae is a flashy, spur-of-the-moment type of girl who's always enthusiastic. When the two end up in the same hospital room, they become fast friends. But when a fight tears them apart, it'll take a lot to get them back together. Can a friendship truly be eternal?

3) Extra story for Yaeka no Karte

By Yaoi Desire Revolution

University student, Shou, started to work part-time as a Shrine Priest due to shortage of money, resulting in him becoming lovers with the shrine’s heir, the overly serious, Ouma!!
Shou’s heart and body are thoroughly offered up. Although Shou was kissed and pestered by Ouma in the middle of cleaning the main temple, Ouma also said, “When wearing these clothes, you are serving the Gods” Ouma was being unsociable to others as usual.
But, once we plunge into H, the way he touches me becomes more intense,
it’s very lew— …What should I do?
I feel like I want to do it at anytime and anywhere <3
A shrine’s obstinate heir X A very approachable priest’s Shinto shrine love!

1-2) Mahoroba no Hibi
Taka is depressed over the loss of his cat, and his best friend Tetsu is at a loss as to what he can do to make things return to normal. Then he meets Hana, a ditzy but adorable "Denpa Onna"...

3) Mahoroba no Nagori

4) Kitan
From Echochi Scans:
He’s been meeting up with the boy annually for the last 7 years in an onsen his grandfather first brought him to. Will he finally confess the truth to the boy that he had been keeping secret of?

5-6) Hana no Ke

Movie advertising agency employee Murakami Chihiro has long carried a torch for fashion magazine editor Motona Kiyoharu, but somehow never found a way to get closer to him. Though excellent at his job and incredibly attractive, Kiyoharu is a selfish person. Then one night after a drinking party wherein Chihiro ends up being tasked with seeing the other man home, he reveals an unexpectedly manipulative side and decides to take advantage of the situation...

Continuation of Kiss, Zekkou, Kiss, a shoujo manga following the relationship between Sakisaka and Hatori--the ups and downs, misunderstandings, the tears and the laughter.
A unique thing about this series is that each story/situation is told twice--once from the girl's perspective, and once from the guy's perspective! The reader ends up learning what each side was thinking.

N/A

4. Kisu, Shite Ii desu ka...?
Yue, Mako and Sana were the best of friends as children. However a love triangle between the three caused a rift in their friendship. Now they accidentally meet as adults; will things be different this time around?

-based on description from Intercross

From Jshoujo Scans:
Mine's first love ended when Setsu, her old playmate, transferred to another school. Before he went away, he left her a message that Mine should not have her hair cut. Four years have passed since then. Setsu came back, but he has changed a great deal. This is a collection of girls' pure love stories.

1. Kiss no Tochuu
2. Marshmellow Baby
3. Sex? Friends
4. Ohimesama no Kagai Jugyou
5. Sora no Shizuku

A chef becomes indebted to the yakuza when his restaurant fails. To pay them back they force him to become the personal live-in chef for a girl they are holding captive.

From Nevermore Scans:

I'm Anzai Mako, 15 years old. This spring I'm going to start a wonderful life at high school... or at least I was supposed to! There's a Host club of young and good-looking rich men that do such odd jobs!! Suddenly I was snatched away by their leader?!

1-2) Tell All With the Eyes
College student Sanjou has a crush on his friend Tsuchida, but doesn't want to mess up their friendship. Lately Sanjou keeps noticing fellow student Morino, even though they have nothing in common. Then Morino catches Sanjou in a compromising position and uses it to his advantage. But Tsuchida doesn't like the idea of losing Sanjou...

3-5+extra) The Sweet Moment I Fall in Love With You
When children's toy salesman Yasuhara Masumi gets the assignment of helping the computer tech who's redoing their system, he expects a total geek. But what he gets is Togashi Yoshirou, handsome, suave and way too touchy-feely!

Seven years ago, Atsushi locked his childhood friend, Kouichi, in a warehouse. After that, Kouichi developed a fear of dark places. Atsushi, who is tormented everyday with the knowledge of his crime, is pushed down by Kouichi, who says, "if you're sorry, let's do it."

From the Animeraider:
Meet Yuka, a 6th grade fashionista who, thanks to her ability to put together just about any outfit on the fly, can disguise herself as nearly any age she wants. She's just a little bit crazy, and has been known to pass herself off as the older sister of her actual older sister. This manga is the tale of her life…

No idea which artbook this was from but this is incomplete and only a partial of the original book.