Taiyou Tsukishima dreams of having a peaceful high school life, but he is assigned to take care of a classmate, the handsome and popular Yuu Yoshida. By spending time with Yuu, Taiyou starts to realise that Yuu seems to be hiding a big secret.

Haruka Mizuta is shocked when she gets confessed to by Naoto Konno a month after entering high school. He used to bully her in the second grade, but it seems he doesn't remember?!

From CoyoMoose:

Nakamura Mei is a very simple high-school girl. While at a cafe with her friends, they bump in to -none other than- the model Shirou's table. Mei apologizes and that's when Shirou notices something. Grabbing her he takes her outside with him and reveals that Mei was once a kids model - and that he's her idol-otaku?!

Also included are two short stories in vol. 2:

• Anya Kouro
• Wonderful Cafe ni Youkoso

From Beyond the Sky:

Akatsuki and his good friend Kiyoharu (whom Akatsuki calls Kiyo-chan) have been playing one-on-one basketball for quite sometime. Unfortunately, things started to change after they joined a very strong basketball team in their new school. Both of them were forced to separate into two groups: Kiyoharu was in the "B" group, and poor Akatsuki was put under "F" group, which is known as the "Failure" group. However, Akatsuki was not discouraged at all. He continues to train hard and always has a smile on his face. Will Akatsuki succeed in his promise to Kiyoharu to become an official player? And what is blocking the path to his goal?

From Chibi Manga:

Rina hates perverted guys. She mixes up her new classmate, Ookami-kun with someone else...
But the truth is, he is a real wolf! Is this sensation of the beginning of love!? Or is it a story of licking bunnies!? Only time will reveal the answer.

From Viz: Rena Sakura is a high-school student with a secret: she's a professional mangaka. And although she's never been on a date, that doesn't stop her from drawing steamy shojo scenes for Cha mi magazine. But when the gorgeous Tomoya Okita finds out her secret, she finds herself asking him out to get some real-life experience in love! Includes the following oneshots: 1. Magic Lesson (Magical Project) in v.1 A girl uses her magic to transform her dog into a human boy. 2. Bewildered Princess in v.2

From Wikipedia:

Shimeru Futaba is a normal high schooler living a normal life, active in his school's wrestling club and slowly getting closer to his awkward love interest, Misaki. This fails to last, as he discovers his family's hereditary genetic defect that becomes active at adolescence. Although it will eventually become controllable, excitement and stress now make Futaba switch sex. Hilarity ensues.

From Wingtip Cafe:

Udagawa Kachiko is a studious no-nonsense high-school girl. One day, she found an entrance to a fantastic world called Fusuma Land.

Abe Maria, an ordinary high-school boy and Nanami Tokuko's childhood friend, is the world's last pureblood vampire!! For 10 years, Tokuko has been encouraging him to become a part of human society, and since then, Maria has come to love humans. As such, Tokuko happily watches over Maria. This couple's story is the world's most gentle vampire comedy.

*Includes an extra story called Manshinsoui no Futari (The Wounds that Cover Us) in vol. 1 detailing a high-school romance between a boy who is suffering mentally and an extremely clumsy girl.

Following the Tuatha de Danaan's seajacking incident, things are back to normal at Jindai High School in Tokyo, or as normal as they get with Sousuke guarding Kaname. After finding out who betrayed Mithril and caused the seajacking incident, Kurz and Mao are sent on a top secret mission in order to capture and bring the traitor back.

However, Sousuke and Kaname's lives are about to change when they meet Leonard Testarossa, a high ranking member of a mysterious group named Amalgam. After their meeting, Leonard warns her that he would do anything to recruit her even if it means war in the streets of Tokyo.

From ADV:

Trouble always seems to follow the beautiful and sassy, Kaname Chidori. Though she is only a high-school student, Kaname is constantly the target of terrorism. Lucky for her though, the dreamy Sosuke, an undercover agent from Mithril, is one step behind her, ready to protect her at any cost. But will he be able to save her from harm every time she is in trouble?

Nina's neighbor, Kyousuke, is starting high school while she's still stuck in junior high. Just walking to their nearby schools together isn't enough for her--especially since they keep running into Yuiko: a beautiful, outgoing girl in Kyousuke's grade who also seems to harbor feelings for Nina's next-door neighbor.

While testing his 8 mm camera at night in his small town, Kaito Kirishima is caught in a mysterious explosion. Strangely, Kaito wakes up the next day perfectly fine, but with no recollection of what exactly happened the day before. Unfazed by what seems to have been just a dream, he heads to school not giving much thought to the incident. Discussing his camera with his friends, they decide to make a movie during summer break. They invite two upperclassmen to participate in the project: the recently arrived Ichika Takatsuki and the odd Remon Yamano. In a strange twist of fate, Ichika starts living with Kaito because his sister has to work overseas. Summer days are about to get exciting for the small film crew.

From Village Idiot:
What will happen to an ordinary human teacher who falls into a youkai school, with his only ally(?) a sexy but air-headed nekomata? A slight ecchi and heartwarming read brought to you by the author of “Sore wa Totsuzen, Unmei no Aite ga”

A short story about a cat demon and a teacher.

From: Easy Going Scans

Ju Ingong (which literally translates to Main character) has been terrifying all his schoolmates in every school he has been so far. He has one extremely scary face type and whoever lays his eyes on him thinks he is a BAMF (bad ass). Although… is he really?

Poor, in debt, and living on instant noodles, high school kendo instructor Kojiro makes a bet with an old friend on a practice meet between the all-girls’ teams of their respective schools. The prize: a year’s worth of free sushi! It’s too good for the desperate Kojiro to pass up! But with only one active member on the kendo team, Korjio must move quickly to put together a squad before the meet. He’s got his eye on Tamaki, the daughter of a kendo master and a skilled swordswoman herself. The only trouble is…she’s not interested. Kojiro’s willing to try anything, but what will it take to win her over?

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.

From Divine Sanctuary:

Ayano, the committee chairman got drunk at a ballgame after party. Next morning, when she came to, she finds herself in Kagura-kun’s bed! Plus she is in her undergarments?! Kagura-kun, who is in the same class as her, is the 10th head of the famous Kagura lineage. Having had one night stand with someone so omnipotent, Ayano can’t help but feel anxious. What should Ayano do?

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).