From Midnight Scans:

My place has always been next to you. Yukihime really likes her childhood friend, Dai-chan. But she's treated as a kid by the "older" and "guardian" Dai-chan. The sad Yukihime finally gets into a big fight with Dai-chan. He tells her coldly that he won't interfere anymore. Yukihime decides to apologize and express her feelings, but...?!

Includes three other short stories:

• Yume Koi
Chiho comes off as a cold person, but actually she is just shy. She likes Tomohiro from her class but is too timid to talk with him properly. So when Tomohiro confesses to her under hypnosis, Chiho is secretly overjoyed but tells him to snap outta it and runs away. But the following day, he keeps talking to her?!
- Shoujo Crusade

• Kiken na Kyouikujisshuu
Toudou Natsu believes that love is fated and hopes to find it in the new trainee treacher, but to her dissapointment he turned out to be a plain guy, but wait...what is this? behind those thick glasses is someone totally different. Is it someone whom Toudou wanted to have a fated meeting with...?

• Himitsu no!? Fuuki Iinchou
Mai is in love with the Discipline Comittee Chairman, Yuujirou. She always breaks the rules so that he noticed her till one day she coincidentally knows his secret in pretending in school. Thus, as return in keeping the secret he has to go out with her but what this act turn to...?

Gisele is a happy-go-lucky princess of an empire covered in snow, renowned for its production of androids. To make her smile more often and avoid all the boring princess responsibilities, Nero builds an android identical to her to act as her double. But when her power-hungry and warmongering father decides to marry her off to a prince of another warring country and use her android double as leverage, what will happen to these two and their country?!

(Source: Batoto)

Every few centuries, 496 demons of the demon world, each choose a human who will fight each other in a tournament of sorts called “Diabloli”. Our main protagonist is a little high school girl who was chosen by the demon she dubbed “Gi-chan”. She was given the power over fire and allowed one wish. She wished to go to school. This is the comedic, action packed adventure filled manga.

The story of Sherlock Holmes, reimagined with Moriarty as the protagonist and exploring his motivation in becoming the greatest criminal Britain has ever seen.

Coming in an omnibus form, it's a side story of Toribako House! The words you longed for, the many things you held dear, everything and everyone, right here!! A girl who has no luck with guys, a weak-spirited otaku boy, a natural lady-killer, a middle-aged couple, a distant relationship -- everyone keeps looking for happiness!?

A cute story about a couple and their dates.

Raw: https://comic.pixiv.net/works/3078

Oneshot that was included in Afternoon’s 2008 Four Seasons Award anthology (v11).

From FCTranslations: Azuki, a young girl whose father is the president of an entertainment corporation, is always out of luck when it comes to dating. It seems like every boy she had dated before all tried to use her as a bridge to get into the world of media. So when Azuki met the guy of her dreams, who also happened to be a contestant in the audition her father set up, she wasn't so sure what to do anymore. *Contains in the 4th volume, Juliet Club: An idol in a famous group tries to escape from his fans by studying in the library. There, he meets a girl who he mistakes as one of his fans and tries to send her away. It turns out that the girl actually doesn't know that he is an idol. They continue to study together in the library, neither of them knowing the other's name, while love slowly blooms between them... *Also another story titled We, the Demon, and Christmas Every year at the time of Christmas, the demon appears, and the Angel twins intend to catch him.

Fuguno Masuo is a hapless 24 year-old businessman who is unlucky in love, He's never even had a girlfriend! After consulting a fortune teller, Masuo believes he'll never have a chance in love. All that changes when he meets the beautiful Nagisa Shiozaki at a marriage interview pub, who herself has had the same poor luck with guys. Now he'll do anything to woo the girl, but he'll have to fend off other suitors and the affections of a co-worker, all while keeping himself out of awkward situations that always end badly for him. Originally penned by YAMAHANA Noriyuki under the pen name HANAKO.

On a rainy day, thirteen years ago, a couple was murdered leaving behind their twin boys, yet one of them is missing from the crime scene.
Nowaday, the remaining twin is seeking revenge.

A Lone wolf in class that has a good looking face, but a nasty personality.
Seeing Tsuki crying when the "person he likes died", Satori suggests he "introduce girls" to him.
At first Tsuki wasn't interested, but the time spent with Satori gradually turned into a special time.
Despite that, Satori grew irritated to Tsuki, that is, until he falls in love with that person.
Won’t you cry for my sake?

Compilation of short stories:

1. Rabu. Sutori Ichi Musu (Love stream)

2. Wandering

3. Tomadoi
A mangaka falls in love at first sight with his new assistant editor. The mangaka's assistant who was a classmate of the assistant editor tries to be their cupid...

4. Fighting Love 20 Years

5. Fighting Love 2000

6. Refrain

7. Drifting and Whirling
Hero regularly dates with a younger and rich office worker for money! But soon, he can't keep such an unfaithful relationship...

8. The Miracle of Christmas
A homosexual college student who is working at a convenience store falls in love with his colleague, a heterosexual and gamblesome high school graduate. Hero keeps pretending to be a good friend but soon he can't anymore because the colleague finds a girlfriend. Then another colleague, a very fat boy who has a steady girlfriend tries to play cupid...

Extra

From PresenceDear:

Marika is impulsive and hates to lose. She's also a woman who falls in love easily. She falls for a sexy older man, a cool classmate, and a beautiful wealthy man. And the man she chooses in the end...? A romantic love story, from the love of her student days to her marriage.

The chapters:
1) Asahina
2) Mikami
3) Kurosaki
4) The dream continues
5) The man I can't forget

A nightmare-devouring tapir becomes stuck in Akane's dreams until she can feed him a proper nightmare.

Legend has it that Nobunaga died in the fire at Honno-ji, but the truth is, he survived! And after that, he vowed to take back the world by his blade! Meanwhile, Hideyoshi and Ieyasu also aim to grab hold of the country, while Mitsuhide plans to assassinate Nobunaga! These swirling ambitions create a new chapter in history! Get ready for some fun historical fiction filled with wild imagination!
From Renta

By the same mangaka of Nyoron Churuya-san:

Yume Midokoro is the tale of a girl whose dreams suddenly become semi-reality, as she meets a clone of herself from her dreams

From ShoujoMagic:
The first collection of volumized short stories by the author of "For You in Full Blossom" / 『花ざかりの君たちへ』 ("Hanazakari no Kimitachi e").

1) The Dreaming Leaf (Yume Miru Happa) -
Futaba (=Two Leaves) departs for Tokyo to attend high school there. In order to relieve the financial burden slightly and achieve independence, she finds a live-in work situation at an old mansion. She becomes (fighting) friends with one of three good-looking fortune-telling employees there, Masato, who attends her same high school and is even in her same class. But then one day, Futaba discovers the secret of the old mansion... which is--!?

2) 17 Romance (17 Juunana Romansu) -
Natsume, now in high school, was raised like the son her father never had, and so she's determined never to lose out to any man. Homare Misono has been her guy friend for 17 years. Despite their closeness, Natsume always feels the disadvantage her gender places her at. Homare is stronger and better than her at a lot of things. And after saving her from a pervert on the streets, he kisses her...!?

3) The Law of Couples (Futari no Housoku) -
The Law of Couples states that all things happen in pairs -- including people. Sakiko seems to have found her missing half in Akio, a boy in her same class who always seems to say exactly what she's thinking. But who is she falling in love with? Akio, or the part of herself that she sees in him...?

4) 3) Heart Fruit (Haato no Kajitsu) -
Meron and her best friend, Chiho, both have a crush on Uchiyama! Meron finds out after she's already told Chiho that she has a crush, so she needs to lie about who she likes in order to protect Chiho's feelings. She chooses... Ryou! The scariest, coldest guy in school, rumored to be an underground ring leader! If anyone will reject her love confession, it'll be him! It works, but then Chiho begins to cry for Meron's sake, and Meron turns to mush... she tells Chiho that she'll try harder to win Ryou's love...!? How deep is she going to dig her grave?? But... for some reason, Ryou really doesn't seem that scary to Meron...

From DMG:

It started out as a way to prepare for a future lover. Too long denied a flesh and blood companion, his substitute—a teddy bear—is now his love object. What happens when a persistent, excessively cheerful neighbor consumes his serious, carefully ordered life? An explosion of hurtful, panicked words.

Stepping back into his quiet life, he can’t avoid what his insufferable neighbor left behind: cracks that expose his festering loneliness. Only one person can fill those cracks, but he’s disappeared.

WEEKEND OF DREAMS: With her brutally honest, trembling line art, isino aya creates a companion collection to Sink into You. Love and acceptance, joy and sorrow, desire and disgust: they move beyond simple shapes in black and white.

Meiji Aporo's just started attending Saint Richard Academy, a girls' boarding school. Unfortunately, Aporo's kind of a massive ditz...

...which annoys her roommate Chiroru to no end.

Not one to be discouraged though, Aporo does her best to win Chiroru over...

...or maybe drive her crazy.

Whichever comes first.

from Horobi no Michi

High-school student Ao decides he’s in love with Ryoumei-san, a priest at the local shrine and Ao’s childhood friend. Not one to beat around the bush, Ao immediately tells Ryoumei he wants to do perverted things together, but it will take more than a little persuading to get the shocked Ryoumei into bed. Between bad advice, romantic rivals, and Ryoumei’s scruples, there are many obstacles in the path of true love.

Note: Shunpei from Koi Cha no Osahou appears in this story as the main character's best friend.