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).

From Nagareboshi Manga:

A collection of oneshots:

PS I Love You
A girl finds a note in a book written by her class' most rebellious boy. Will this note somehow connect them...?

Koibana - Koi
A young hostess finds some joy in her life by helping a boy become more confident in his love life.

17 Sai
The best friend of the girl in the story get along really well. Until one night where something happens between the two of them and everything changed after that.

Happy Honey
A girl finds herself the object of an American boy’s affection. Can she respond without prejudice?

From Manga Art:
2nd year Junior High schooler, Misaki is in love with Mutou-kun in her class. But the one he loves is the class idol, Kuririn. However, Misaki doesn't need to be depressed. She's got other options...!?

* Contains an extra story called Shotto Sunzen!.

Ishiyama High is a school populated entirely by delinquents, where nonstop violence and lawlessness are the norm. However, there is one universally acknowledged rule—don't cross first year student Tatsumi Oga, Ishiyama's most vicious fighter.

One day, Oga is by a riverbed when he encounters a man floating down the river. After being retrieved by Oga, the man splits down the middle to reveal a baby, which crawls onto Oga's back and immediately forms an attachment to him. Though he doesn't know it yet, this baby is named Kaiser de Emperana Beelzebub IV, or "Baby Beel" for short—the son of the Demon Lord!

As if finding the future Lord of the Underworld isn't enough, Oga is also confronted by Hildegard, Beel's demon maid who insists he take responsibility as Beel's guardian. Together they attempt to raise Baby Beel—although surrounded by juvenile delinquents and demonic powers, the two of them may be in for more of a challenge than they can imagine.

1-4) Akihabara Fall In Love
Hasegawa was always called an Otaku when he was younger because of his glasses. Because of that, he had to hang out with other Otakus even though he didn't consider himself as one of them. He completely changed his image in middle school and finally landed in a large company after graduating from university. However, he has now been appointed to a local area, Akihabara where he once again finds himself shoulder to shoulder with other otakus.

One day, on his way home from work, he decides to help an otaku looking kid from getting robbed. However, he gets hurt and the next thing he knows is waking up in a strange room and encountering the person he helped in a compromising position.

5) Extra: The Coward's "I Love You"
Haru's childhood friend, Genta, is the new transfer student from America. Since their mothers were classmates in college, they spent most of their childhood together and Haru has loved him since then. But when the grown up Genta tells him that he has someone he likes, how will Haru react?

A girls' high school that Mamoru attends has amalgamated a boys' high school, which was her wish for a long time. She expects that she will be able to find a boyfriend soon. However, boy students are around ten percent of girl students, and Mamoru is annoyed because her classmate Azuma makes a pass at her. He is known to be dirty-minded. When she was fighting against him as usual, he kissed her all of a sudden.

Also contains two extra stories:

- Let's Study Together

- Where's the Love, Where Are You