Love in middle school is a simple, straightforward, and exciting thing.Love in high school is a bittersweet thing that makes one anxious and timid.

From Phantom Scans

Kyoichi's elite high school and the delinquent school next door are separated by only a fence. One day by the fence, Kyoichi meets Chiba, a fearsome student known for speaking with his fists......a school story of star-crossed lovers.

From Blissful Sin

* Fetish
"I've been watching you from my seat at the back of the classroom. I really want to touch your hair no matter what-!"

* One My Star

* Torawarebito (Prisoner)

* Beautiful Days
Reo is an average, hardworking salary-man. He shares an apartment with his boyfriend, Shinri, whose life couldn't be more different than his own. Reo is sick of Shinri's attitude. He is a lazy, demanding man who speaks of little but the filth of the world and the importance of beauty. When two men on different paths find themselves in a relationship which is more straining than nurturing, can it last?

* Photograph
The story begins where we left Reo and Shinri from Beautiful Days - each deeply absorbed by their contradictive relationship. Shinri's strong attachment to Reo is unveiled, but is it too late to save their troubled love?

* Torawarebito extra

* Fetish extra

It's been a rough day for our leading lady, Ana.
First she finds out that indeed she is half-dead, but then she learns that in order for her to return to the world of the living she must survive a battle royale of sorts with her classmates.
With limited spaces available will our Ana make it back?

The story follows an unfortunate High School student, who one day meets an old man ribbed by delinquents. The man asked the student what he desires as a favor for having helped him, but he didn’t believe the man and left. However, when he fell asleep at night, he wised he were stronger in order to take revenge from the delinquents. When he wake up in the morning, he saw his body changed and a demon appeared in front of the window…

1-3,6) Summer-Colored Boys
A new school year is often synonymous with new class and getting to know your peers. It is an opportunity to meet new people & making new friends. And sometimes it doesn't take much to bring two people together, who at first seems to have nothing in common, just like Tomoyuki and Aoi. Nothing seems to predestinate them to be more than just classmates, and yet the simple fact of sharing the same surname seems to make Aoi consider Tomoyuki his future best friend. Even though Tomoyuki is reluctant at first, he is gradually tamed by this exuberant boy. Until the day he realizes a new overwhelming feeling, but it's already too late to go back...

4) Honey
Even though Yuuki is the one who confessed Tooru still feels insecure in their relationship.

5) My Love Life
Soccer player Shintarou comes across Haruka and mistakes his Senpai for a girl. Shintarou's not will to give up just because Haruka-Senpai turn's out to be a boy though. Shintarou's a great man who's hearts bigger than the universe. He'll even love Haruka-Senpai's male parts!

When it comes to cooking, Haruka cannot do anything right. She develops a crush on Kurogane-kun who appears to be a nice, shy boy. As Haruka strives to get closer to Kurogane-kun she discovers that not only is he secretly a devil, but he is also known as the household prince!

From Perfect Illusions:

This is the story of Hamada Akari, a sixteen-year-old girl whose father has problems with money. To pay off one of his debts, her dad sends her as a servant to the Otomo family. She is forced to live with them and attend a private school where only the richest and snobbiest kids enroll. The son of the Otomo family fights constantly with her and the tension between the two never seems to disappear.

Akiko Chirubi (明子 智流美) is a boy who studies at highschool in Tokyo. When he turns to 17, his life suddenly changes. He starts to hear strange parasyte voice on his mind and gets confused and mad. Moreover a digital virus occupies smarts phones world wide and very strange situations occur everyday. His best friend Tsukide Akari (月出 光 ) tries to calm down and help Chirubi but she has a secret. There is one thing clear. The world is changing strangely. Is going to Chirubi get rid off the sounds on his mind? What is the secret of Akari? What is going to be to the world after all?

Love in middle school is a simple, straightforward and exciting thing. Love in high school is a bittersweet thing that makes one anxious and timid. This love is a secret.
Two childhood friends and neighbours suddenly stopped talking to each other after summer break. What could have happened between these best friends who used to be joined at the hip?

A teacher is looking for a school by the name of Seishou Academy, as he is a new transfer teacher for that school. Seishou Academy is known for having students with excellent marksmanship. However, he gets lost along the way and decides to look for someone who knows where the school is at a summer festival. He encounters a girl at a shooting range and finds her marksmanship skills to be professional. The girl tells the new teacher that she is an assault rifle, not a student. Her name is FNC and is an assault rifle of Seishou Academy. The new teacher attends school the next day to find students, including FNC, practicing shooting M16s and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy?

Note: Chapter 9 technically doesn't exist, it was skipped when "Upotte! Nano" switched publications from Young Ace to Shōnen Ace.

Sudo Nagiko aquires a Boyfriend unwillingly. The Boy named Tobita decided to be her Boyfriend after calling her Ugly. He does not seem the type to take no for an Answer, especially after showing Yandere tendencies.

AF begins his second year of high school, depressed over the mundane nature of his life and his inability to find himself. The strange thing is, whenever he is depressed, AF always starts seeing three strange little things flying around him. No one else sees these oddities, and aside from their occasional presence, his life remains incredibly ordinary…That is until he meets Sane, a girl who suddenly asks him to teach her how to play guitar, and a strange middle aged man that speaks to AF about the difference between reality and dreams. From that day on, AF starts experiencing strangely real dreams, but they are still just dreams…right?

Once upon a time, there was a boy who was bullied by his peers because of his honest, straightforward personality. This boy was befriended by a brother-and-sister duo who vowed to be his friends forever. Unfortunately, the boy's family moves away, leading to their fledgling bond being severed.

Years later, the honest boy has found the perfect way to make 'friends,' be admired by students and teachers alike, and avoid being picked on: maintaining a false personality as the "School Prince" while carefully hiding his quarrelsome, devil-may-care attitude from the public eye. But his peaceful - albeit mind-numbingly boring and somewhat lonely - days are thrown completely out-of-whack when a pair of twins transfers into his school.

Takai Ayano, university student, was confessed to by her cute, little sister-like classmate Morino Mami and a heart-pounding relationship ensued.
A series about Mami’s & Ayano’s dreamy-swoony (and lewd) campus love story.

(Source: Translated from official description)

Urushima Nikoge is a model student who has a secret: he loves cute and fluffy things to the point of obsession! So when a fluffy transfer student enters his class, it looks as though his "perfect" image is about to be shattered…

From Chibi Manga:

Aira's high school classmate, Kojika Ichita is violent, scary and hard to get close to. But, under certain circumstances, Aira and Ichita are now staying under the same roof!! Furthermore, when Ichita's switch is turned on, he will transform into a wolf...!?

Taken from the Infinity Studios LLC website:

How do you distinguish between the love from a cute neighborhood girl (who’s like a little sister to you), and the love from the hottest, yet quirky, girl in school? This is exactly the question Myung-Ho has to ponder when both his neighbor’s cute little daughter, Ji-Hae, and his school’s most popular diva, Yu-Ri, make him their valentines. Of course he cares for Ji-Hae, because the poor girl’s already been through so much for someone her age, but still, she’s only just a kid. Then there’s Yu-Ri, the girl of his dreams…or rather, she would be if she wasn’t a fortune-telling voodoo witch doctor. Oh and yes, it would also help if her father, the local gangster boss, wasn’t out to kill him.

When you’re as lucky as Myung-Ho is(?) choices are very hard to make. On one hand, he could go out with Yu-Ri by turning down Ji-Hae, breaking the heart of a child who’s been depending on him ever since she moved in next door. Or, he could choose Ji-Hae by turning down the only chance at romance with a beautiful girl dead set on making him her destined love. Choices, choices…

Shion Shoji, 15 years old (?), is a brilliant and gorgeous high-school student!! Tsubasa Raimi, the lucky boy who sits beside her, is torn between whether or not to ask her out. Because, I mean... she's totally a zombie!! Get ready for surreal gags and modern, refreshing, and slightly bittersweet school life, because even zombies need love!

Collection of short stories:

1) Real Kiss
The player, Fujikawa Mitsuki, likes to tease Haruna. One day their cell phones get switched. What will happen next?
(Also published in Koibana)

2) Real Love

3) Real Kiss - Heavenly Eyes

4) Real Kiss - Side Fujikawa