From Chibi Manga:

In that world, there are popular people and not popular people. That’s what that Miya-kun told Rui (17 year), who is not popular, after he dumped her. But what kind of girl will replace her…?!

Himoto Sora is a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Gakuen, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused she steps in and through some sort of error unwittingly becomes the first female participant of the game.

Republished in 2017 in a 3 volume omnibus
1) Shitsurakuen - Hangyaku no Otome no Shou
2) Shitsurakuen - Shinai no Otome no Shou
3) Shitsurakuen - Rakuen no Otome no Shou

In this story set in the early 1980s, a young man dreams of becoming a renowned comic writer in years to come. His name is HONOO Moyuru. He has no money, only a dream. Then, he feels overwhelmed by his lack of ability, and buys some sake, although he has no head or stomach for alcohol. This is a tortured elegy for any dashing young art student who spends his days careening around in burning ambition. Note: Was nominated for the 3rd Manga Taisho Award in 2010 and for the 19th Tezuka Osamu Cultural Prize in 2015. 

From Evil Flowers:

1) I should have...
En Asakura often has the same dream lately. She dreams of a boy asking her to kiss him. Her dream is connected to a painful memory from her high-school life, when she felt in love with a boy named Maru. When he asked her to kiss him, she refused, and now she's regretting it. Not to mention that the boy started to date another girl after that incident.

En is now in university and is trying to find her life partner through goukon: blind group dates. What will she do when a boy with the same name as her past crush asks for her number? Will she refuse and regret it again?

2) The Realization Of Happiness
Continuation of the preview chapter.

3) After School Kiss

4) Tell Me You Love Me

5-6) My Friend's Boyfriend

A strange phenomenon where one is transferred back to the moment right before something life-threatening occurs. This continues to happen until the cause of the threat is erased. It is as if somebody is forcing Satoru to stop it from happening. Then one day, everything is changed. What truths are revealed when Satoru comes face to face with his own past? How will they affect his future?

Boku dake ga Inai Machi: Re (Gaiden volume) is considered volume 9 of the series

Note: Was nominated for the 18th Tezuka Osamu Cultural Prize Reader Award in 2014 and for the 7th, 8th and 9th Manga Taisho Award between 2014 and 2016. Also nominated for the 40th Kodansha Manga Awards in 2016.

From Stage Storm:
Seiko is a normal girl with a tendency for daydreaming, and Yoshito's a fairly sensitive, subdued boy. They've been close friends since grade school, and now that they're in high school, their feelings for each other become complicated. Though all of the diverse array of characters in the story seem to see it as plain as day, Seiko does not realize Yoshito would like to be more than friends.

In this direct sequel to Shiritsu St. Cattlya Youchien, we follow the story of teacher, Kuroda Shuuichi, and his adorable students as they move up to elementary school. Excited to be moving towards becoming a real teacher, Kuroda leaves the preschool only to learn that his new position is the elementary school with his old students. The incredibly unique kids are back including the Fuurin and Katori twins, the cheerful Miki, the shy Tsumugi, calm and collected Nazuki, and the panda hat wearing Daniel. The adorable yet weirdly mature children will capture Kuroda sensei’s heart once again.

From Wasurenagusa:

As a child Tanabe was always tagging behind Haruyama, but in high-school after he became a ping-pong ace their relationship is gradually getting worse. Who is the one tagging along for real and why is Tanabe always so quiet? A touching and yet funny story with ping-pong as its background.

This volume also contains a one-shot about one very interesting hairdresser and a two-chapter story about a dentist and his fated client.

Shino-chan can't say her own name. She made the first friend after entering high school. Communication full of clumsiness begins. They always find right words belatedly. But the Seishun can even turn a klutz into a star...or not?
[description on batoto]

About a girl with stammer aggravated by social anxiety, and her early days in her high school class.

In this country, every person has to be matched up with a partner. Partnerships are made around when you turn three or four. The doctors decide who gets paired together. One person acts as the 'supplier.' The other as the 'receiver.' It is impossible for a 'receiver' to continue to live without periodically being given power from the 'supplier.' And in the same way, it is imperative for a 'supplier' that a 'receiver' accept some of the power generated within their body. This 'power' can't be made anywhere other than inside a 'supplier's own body… So for the 'receivers,' we 'suppliers' are completely indispensable...

A collection of one-shots:

• Sleeping Beauty no Mita Yume (Sleeping Beauty's Dream)
Tsukasa gets a kiss from the girl she likes, but she's not happy about it.

• Hakushi (Blank)
The protagonist loses some of her memories and can't remember a girl who was very important to her.

• A Witch's Hand
It's about psychological manipulation.

• 20, 21
Fuji doesn't see her friend Asagao in a romantic light, but Asagao is hoping to change that.

• Hakushi, Continued (Blank, Continued)
Retells the events of "Blank" from Takako's perspective.

• Twelve-Year Age Gap, Six-and-a-Half-Mat Room
About the relationship between a schoolgirl and a twentysomething recluse.

Oneshot about a confession that makes things awkward.

Yuri calls him Hanao (meaning 'Flower Guy') because he likes growing flowers. Hanao's dream is to grow the most beautiful flower of the world. Yuri promised him years ago that she would support him to realise his dream. Now, as a high school student, is it time for Yuri to fulfil her promise?

Short stories of romance between girls who strive to improve on their magic in an academy.

Shuhei Kurata is stuck. Going to a new school where he doesn’t fit in, standing still as his old friends leave him behind. Watching silently as the woman he loves slips further and further away. He feels detached and out of place, as if maybe it all might be a dream. Perhaps it is.

1-2) You're My Sex Star
3) Cryptic White
4) Tonari Awase
5) Loose Socks Boy
6) Lipstick Boy
7) Haru wo Uru in Sexy Call Boy
8) Hitori Asobi in Lock Up Boy
9) Please Don't Touch Bunny Boys. in Pretty Bunny Boy
10) You're my Sex Star Extra

Out of the billions of people there are in the world, I saw you. Dreaming of love and friendship.

Tomoka and her boyfriend You are going to be married! As they exchange their vows, You proclaims "I don't." Surprised, Tomoka just found out that You doesn't remember her at all! What will Tomoka do? Will You ever remember her?

There's an urban legend about a hero that is able to take out entire groups of delinquents. People have only seen the hero's back, where there's an X upon the hero's clothes. A friendless yankee type girl wearing an X on her back, Kinami Shino, may be this hero. She forcefully makes friends with Batsumaru, a boy with red and white hair, dragging him unwillingly into the world of violence. But is Shino really the hero or are things a little more complicated?

From Chibi Manga:
"I'm going to be a boy starting today" It's so much fun after quitting being a girl!!
A girl inside a boys' high school! A monkey girl is passing by!!