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

Anzu Ogura is 17 years old. No boy tries to seduce her on the street, and she attracts no boys at parties. Her male acquaintances are only three Omihara brothers of the next-door family. Now she gets completely confused by them.

A collection of short stories:

1. Irabayashi-san no Phantom Arm
Irabayashi Fumi is a cute teenage girl and the ace of the school swimming team. One day, she unexpectedly joins the occult club. Isahaya learns her secret: she's trying desperately to rid herself of two invisible 'phantom arms.' Will he be able to help her?

2. Sunaboshi
After the tragic, accidental death of his clubmate and crush, Hiori, Kyouta's astronomy club is abolished. One day, he wakes up to find that his broken binoculars have manifested a girl that looks just like Hiori...

3. Okurimono
The brief story of Sano, a boy who dreamed of being an artist, and his first love Abe Kanako, who dreamed of being a performer.

4. Kotonoha
When Hana was little, she used to tell all the boys she liked them. One day, a demon appeared and cursed her, telling her that any boy she confessed to would die. After the next boy she claimed to like died in an accident, Hana became terrified of dooming any other boys to death. Six years later, she finds a boy she actually wants to date, but can she do so without bringing down the curse?

5. Living Quarter
Humanity has split into two forms: the winged people who live in the sky, and the ordinary humans who still live on Earth. Kae, a normal human, has a grudge against the winged people for a tragic occurrence in the past. However, Kae's mother is winged. Kae must decide whether to allow herself to become a winged person or essentially lose her mother.

Murakami-kun's dream is to have an ideal relationship with a normal girl like in shoujo mangas. One day, a girl finally confesses to him but to his surprise, all she wants is his underwear! Now, what kind of love story will unfold with his underwear at stake?

Roma is a mysterious girl that is on a mission to collect “human greed” through the use of various magical objects that have unique powers. When humans use these magical items to satisfy their own personal emotions, such as love, their greed level increases and Roma is able to steal their excess greed.

The people that use Roma’s objects seem to always let their greed destroy themselves, putting themselves in a worse situation than before.

Note: This manga is not completely scanlated into English. Due to a chapter numbering error, chapter 6 was incorrectly indicated as having been scanlated by Simple Scans. It has actually not been scanlated. However, all other chapters (including the final chapter, which should be numbered 25 and not 24 as seen here) have been scanlated.