From Mangascreener:

The only common feature running through these stories is a grown-up protagonist somehow coming face-to-face with his childhood past, in a testament to the loss of youth, the disillusionment of growing old, and nostalgia for better times.

In the Adachi pantheon, this is a rare diametric view of his eternal theme of "youth," in this case youth as seen through the lens of the past. It's a powerful statement from Adachi that might even be an acknowledgment of his steadily-creeping age.

What is impressive about these stories is not the plots or characters themselves, but the absolutely perfect way he tells them, another facet of experience that comes with age. Most of the stories may require multiple readings to fully appreciate the airtightness of the plot and visual motifs."

Oneshot about Takeshita Mari, a 3rd year in Junior High School who has a crush on her teacher.

Six stories by Rumiko Takahashi:
- One Day Dream
- Graffiti Pop
- Dutiful Vacation / Giri no Vacance / Holiday-In-Law / A Compulsory Holiday (婆婆的假期)
- Help
- Red Bouquet
- Permanent Love

From Shoujo-Sense:

Ririko has been in the hospital for 10 years. During that time, she was writing a note for her wishes that she wants to fulfill. Will she finally start realizing those wishes?

Ryun is an unmotivated high school student who feels like there's nothing to do in life. Min is her childhood friend who is annoyed at his own popularity. This series is about their daily lives, who they meet, and how they grow.

Compilation of 6 stories with a realistic feeling to them:

Shiki no Zenjitsu
Two people spend the last day of their cohabitation together before she gets married.

Azusa Nigou de Saikai
A father visits his daughter when her mother isn't at home.

Monochrome no Kyoudai
Two twin brothers reunite for a drink after ten years.

Yume Miru Kakashi (1st part)
A man who left for the city ten years ago returns to his home town for his younger sister's wedding.

Yume Miru Kakashi (2nd part)
The returning brother reminisces about their childhood in the countryside.

Juugatsu no Hakoniwa
An unknown high-school girl moves in with a struggling writer.

Sorekara
A cat observes the actions of her mysterious and rude owner.

From Lovers Dream: A high school boy and a female student spend the night in a hotel after drinking a little too much... ... without being able to remember what may have happened between the two of them! Three months later, the female student comes back to the young man telling him she might be...pregnant...?!

From Hidoi~! Translators:
Another tender love story which fails to run smoothly from Kawachi Yukari!
This is a one volume "novel" type manga.
Rui will be a model, and Tougo will be a painter - the two young childhood friends dream about their future. When Rui's father dies when she is 17, she goes to Tokyo, to fulfill her dreams - and meets a handsome make-up artist and...!

These are stories that deal with being an underage mother and how the characters dealt with the situation.

by Forbidden Garden:
a series of oneshots:

We are merely 17 years old and in love. And then I suddenly got pregnant, although he proposed to me straight away, my parents were against this, but I don't want to get an abortion, I want to be a mommy. No one can help us... which path is there for us to take?

Little Life Growing Inside - Falling in love, and then getting pregnant, is that a sin? Just because we're still in high school?

Spanning the Lost Life - Getting an abortion during the age of 15, and then being betrayed by the lover. I won't love anyone ever again, definitely...

I Will Become a Strong Mother - I'm a single mother, I have a crush on someone, is having this type of feeling a burden?

Believing the Feelings of Love

In this small town, within the 49 days after a person dies, you can see the dead's spirit. She once admired this small town where you can still spent time with the ones precious to you within these 49 days, but...

Includes two oneshots (not yet scanlated):
Soko ni Koi Ari (そこに恋あり)
Kimi wa Nanimo Hoshigarazu (君は何もほしがらず)

From Boys On Boys Love:

1-2. 2-dome no Koi no Hajimari wa
After being harshly dumped by his lover, Kousaka Yuuki, a shop manager at a restaurant, swore that he would never love again. One day, he meets his ex again when he unexpectedly shows up at Kousaka's shop. It was then completely exposed to Matsuoka, a kouhai at work, that he dated a guy. Kousaka was shaken that his past was known to Matsuoka, and worried that he would look down upon him, but Matsuoka forcibly kisses him and says "I love you" to Kousaka...!?

3. Gekiai Honey
Sasaki Ryoutarou, a part-timer at a restaurant leading an ordinary life, suddenly met his old classmate, Mio. Mio was once a gloomy guy ignored by all, but is now a cheerful, completely changed guy. He claims to have been searching for Ryoutarou to be his lover because he couldn't forget about him, even after being rejected a long time ago. Mio changed his style because he had heard that Ryoutarou's type is a cheerful person. Ryoutarou refuses to go out with him, to which Mio responds: "go out with me for a month, if you don't fall in love with me then I'll go back"...

4-5. Honey Trap
You is in love with his best friend Shinji. Afraid of ruining his friendship with Shinji, he doesn't confess, and breaks off all contact with him. Three years later, running away from some stalker, he enters a building and asks for help. However, it turns out that the man living there is his ex-friend Shiniji, who is now a detective...

But what will happen when Shinji suddenly asks You to be his lover?

6. Bokura no Koi no Hajimari wa

- Extras
Is a small continuation about the first story.

The student council president is gaga over the vice president, but her feelings may or may not be returned. In the meantime, it's up to the serious and by-the-book vice president to keep the flaky (but surprisingly effective) president on track.

"I am, in fact, one of the dead."

So says Acony, a rather mischievous girl, upon her first meeting with protagonist Motomi. Newly moved into an ancient apartment, how will Motomi handle Acony and all the bizarre residents?

Han Summer (Yeuh-Reum) and Hyun Moo-Heum are very different from one another. While Moo-Heum is a brilliant, yet stunning son of a CEO of one of the most influential and extensive companies in the world, Summer, on the other hand, is a mediocre-looking girl - a plain Jane, who is just under an inescapable debt of 70 million! And to whom? It is none other than Hyun Moo-Heum! In the midst of this dilemma, a mysterious figure enters and intervenes with their lives. Could he be of any help to Summer or is he destined to make her life more complicated than it already is?

From Pink Rose Scans

Mizutani Yoshiki is a 21 year old working as an assistant director for TV shows. His friends from back in high school are all jealous because they think that he's able to rub elbows with celebrities but in reality, he's so far down the TV industry hierarchy that he's more the resident lap dog relegated to doing everyone else's dirty work.

One day, he gets assigned to help out with filming for the latest "it" drama. The lead female actress turns out to be none other than Fujiidera Mitsuko, the girl he had a crush on back in high school who's now become one of the hottest rising stars in the acting world.

As he quickly finds out though, she's nothing like the shy, quiet girl he knew from back in high school. What happened to her for her to have changed so much?

Includes another story
・「My dear B・F」
Ever since the car accident that ended her dreams of becoming a short track athlete, Yumi's been struggling to pick up the pieces and move on. One day, a mysterious boy who calls himself "Jiro" crashes into her in the school hallway. They quickly build up a close friendship---but there's something strange about him that she just can't put her finger on. Who is he really?

1-2. The Which Is Love?
"Sheesh, he’ll cry over any type of love. I really can’t understand it."

Nonami ended up having to comfort the heartbroken Hino after he was dumped by his girlfriend. Even though Nonami thought he couldn't comprehend it, he was charmed by Hino's honest feelings. A heartrending story of sweet youthful gravity.

3-5. Sen no Yoru

6. Love and Goldfish

7. Sen no Yoru Extra

Iriya Tetsuo was the nice, quiet kid that everybody knows. Until well-meant prodding on the part of Hanada Satoshi made him choose the 'easy' way out. He purposely failed the entrance exam to a good school, and picked fights so that he wouldn't have to be around Hanada anymore.

The last thing he expected or wanted was for strong-willed Kizu Ryouji to show any interest in him. The sparks fly between the two, while Iriya's best friend Kasuga Ryouta watches jealously...

Divided into four chapters entitled respectively 1970, 1974, 1976 and 1980, the story focuses on a young couple, Keiko and Kosuke.
They meet during high school and soon become friends. Koisuke aspires to become a famous movie director and Keiko helps him with his project in a competition. The outcome is brilliant but not much later Keiko sees him kissing another girl. During the next years they will meet again, but will they be able to overcome their misunderstandings?

Taken from Solaris-SVU:
Ikuru is a boy who doesn't have long to live. Growing up questioning the purpose of his life and the reason for his impending death, he's constantly confused and lonely. After learning that he doesn't have much time left, he requests that a special "girl" called a AGH-RMS (Artificial Genes Human Regenerated for Mental Support) be given to him. These people are genetically made so that they help heal and ease the mental burdens of the terminally ill. This manga is cute, sad, and ultimately a story about life, death, and humanity.