From Ochibichan.
Oukawa Nabiki is an energetic and cheerful girl who dreams to become a stuffed toy maker. Ever since she joined Kousei High’s Crafting Club, with Fukamachi Itsuru, a boy who dreams to become a silverwork designer, both of them work hard together to become professionals! But due to the fact that Nabiki has to attend extra lessons, she’s not allowed to do any club activity for a week?!

1-3) Bunbetsu to Takan
Aya has a great boyfriend Kento who treasures her a lot. But she is also attracted to Kento's older brother, who has a twisted personality. How come she can't stay away from him and she goes so far to cheat on her boyfriend? Will Aya's sense prevails over her sensibility?
From Jshoujo

2) Delusional Diary
Ui fell in love with the wrong guy. Jiro is popular and handsome, and agreed to date her, but he insists that their relationship should remain a secret. Ui starts to feel more uncomfortable about her love situation and her trust in Jiro is weakened by his cold attitude towards her. Is Jiro cheating on her or does he just have a very weird way of expressing his love?
From Evil Flowers

3) The Little Mermaid who Became a Witch
Everyone knows the story of the little mermaid who fell in love with the prince and exchanged her voice for a pair of feet. Did anyone wonder about the witch’s story and why was she so bitter towards the young mermaid? An interesting twist of the classic “The little mermaid”, this time, from the witch’s point of view.
From Evil Flowers

The fiance of the witch Meru is a sexy and wild werewolf?!

The witch Meru and her werewolf fiance, Riku, should have been married...but on the day of the wedding disaster strikes! A spell that the magician Nazo was casting accidentally hit Meru and she transformed into a little kid!! The only one who can return her back to normal is the one who cast the spell and Nazo has quickly escaped. What happens to Riku on the quest to find the missing magician? And how does their love stretch with Meru stuck in a little girls body? Will things ever go right for this unlikely pair??

Extras:

V.3 - Saigo no Onegai
V.4 - Renai Gokuraku Joudo
V.4 - Koigami - Love God

The tragedy of the feelings of the boys, gathered at the illusionary boarding school...

[Summary from Aerandria]

A manga consisting of a 9 chapter story with 3 side stories.

Shinju no Kusari (Chain of Pearls)
The beautiful, genuine pearls we lust after belong in a chain... because that is how they bind our hearts. Hisa, the newest manager of her high school's soccer club, has a secret: a part-time job. If anyone knew, she would either have to quit the job she needs to survive or the sport that she loves. Sakyou, one of the team's most talented and anti-social members, finds out about Hisa's secret... so it's a good thing for Hisa that the handsome and high-handed Sakyou wants to keep her close to him! Or is it? (There is an additional one-shot of this story in Vol. 1 of LoveSupreme Principle)

A "Girlfriend" with Substance
(scanlated as The Fruit Called Grapefruit)
Minami Kanan's debut work. Sachi was so determined to become Takanori's girlfriend that there was no way he could say "no." Literally, no way. She's the girlfriend he was forced to have, and he treats her as such. They go out together, but it seems obvious that Takanori hates every moment of it. When Sachi finally has enough of his unaffected attitude, will it make Takanori happy to be alone again?

Unconditional Love Formula
Tachibana Kouya is a whiz kid, while Ayumi barely passed the entrance exams. They're at opposite ends of the spectrum, but Ayumi is determined to win Kouya's love by having him tutor her -- then, when she passes the physics exam, she's going to confess. Why would Kouya want to tutor such a poor student, though? Ayumi's love rival discovers that Ayumi had to bribe Kouya to do it, and so she feels no remorse when she ruthlessly foils our heroine's efforts to succeed in physics and love...!

The Rumored Natori-kun
High school freshman Ai just found out that the stranger she fell in love with at first sight is the notorious Natori-kun, who goes to her school and is rumored to ditch every girl he agrees to date. That doesn't discourage Ai, though, because he's been nothing but nice to her so far. What will it take to become Natori's girlfriend, or is Ai doomed to become just another rumor?

From Condensation:
The story centers around Keito Aoyama, a former famous child actor. Due to a childhood incident, she retired from her career early and withdrew from normal society. Now 16, she passes her days in boredom and without purpose. But one day she runs into a stranger who takes her to El Liston--a free school for high school students like herself, who don't have a place where they belong. Though hesitant at first, Keito decides to enter El Liston and subsequently, she begins a new stage in her life. With the help of her only remaining childhood friend, Taiyou, and her new classmates Rei, Momiji, and Kouichi, Keito slowly finds the courage to open up to others and to accept their support. Will Keito return to acting? Will she find true friends? Love?

From Entropy:

Jin Young is a good student with good grades, but she has a little bit of an unstable mind. Hye Jung is a cheerful girl who helps out at her mom's "snack shop", a sort of small restaurant that offers light meals to diners. Both attended the same school, and both transferred to an independent-study private school, where they meet Si Hyung who is an instructor there. Si Hyung used to live in the same neighborhood with Jin Young when they were young, but he's surprised how Jin Young has changed into a cold person.

By anonymous:
Nohae has been crushing on Dona, his neighbor, since they were younger. Dona is a girl who was obsessed with money as a child and would make her childhood friend Nohae actually pay her. Time has passed and now she's a teen, broke and living on the streets with her dad. Her dad meets Nohae and arranges for Dona to live with him. But Dona's not your typical heroine. She's one of those fake people, maintaining a perfect image at school but in front of her parents she's self-absorbed, a glutton, and is quick to nab a meal or swindle money. She's quick to anger and has a grudge against Nohae, but he likes her so much he's completely unaware.

From CMX:
"Chaos" is a trading card game that is very popular at Manami's school. Trying to learn more about it herself, she purchases a beginner's set, only to discover that it contains "Sahgan, The Mighty Sorcerer," the rarest card in the game. Now every other player is out to win the card from her. But Sahgan himself begins to visit Manami in her dreams, offering her advice on how to win.

The story about Caramel Theater, their owners and workers with different personalities! Love, friendship and family will tie them together or make them want to strangle each other!

A volume of cute and romantic short stories:

• Caramel Milk Tea
Nozomi, a high school student, did not believe in love at first sight. But it happens that she is in love with a cafe clerk. Immediately she declares love to him. But because he gives her the cold shoulder, she is disappointed in love. Now she begins to work part-time for the cafe where he is working.

• Futari no Jikan (Two People's Time)
Eri hangs out with her childhood friend, who she hasn't seen in four years. They've changed over the years, but certain feeling have stayed the same.

• Kirakira no Kimochi (A Sparkling Mood)
Narumi tries to make the most of her time before she moves on Christmas Day, but falls unexpectedly in love.

• No. 1 Girl
Saiko must choose between her career or her love.

Orange Kiss contains Happy Words, a prequel of No. 1 Girl.

From Esthétique:

The cute new heiress of the Jo-Sun throne, Jung Gyuh-Woon! She ends up having two handsome bodyguards by her side! Through all her happiness from being escorted by the knights as the queen, the danger surrounding her slowly creeps closer. Knights, you have to protect the Queen!

From MangaHelpers:
After high-schooler Nanatsu Io is crushed by disappointment in love, she finds herself pulled into a strange cafe, "Cafe Acheron," by pretty male workers, Kiba and Resato. Io decides to change herself by getting a job there as a waitress. In order to do so, she makes a contract with the cafe owner, Kiba, who tells her she must keep her stuffed bear (now conscious and referring to itself as "Father") with her.
It's only after this contract is formed that Io begins to learn the truth! Cafe Acheron connects the demon world and the human world, and it's there that many deals between demons and humans are made. In fact, Kiba and Lesath are demons themselves, and Io is already bound to them by contract! Her strange new life is just beginning.

From StarryHeaven:

High school first year Sara has a secret…she’s really the super-popular singer SALA! However, as an idol her gender is kept a secret from the world in order to sell her music. But can Sara win when she wants to be just Sara…?

From MangaArt:
Kisaragi Arisu has wanted to be an idol for a long time. When she blew her last chance, a guy ran into her and dropped his watch. She tries to find him, but finds herself in Channel W director's office instead. The director told her he needed a girl to do a report on his show. She readily took the job, thinking that this was a debut she was looking for. Will this be her big break?

From Aerandria Scans:

From time immemorial, vampires inhabited the darkness. They were an immortal clan who shared the color of their iris with their partner... Until the appearance of the beautiful girl "Jasmine". Both of her eyes glittered with blue sparks. She is a vampire too, but what is her goal?!

Dare to open the scroll with the legend of the beautiful dancer China Blue...!

By Strawberrie:
Yuzu's big sister, who had raised her alone after their parents passed away, died in a traffic accident. Yuzu decided to take care of her sister's son, Sho. Together, the two face life with all its hardships. Chikyuu Koushin-kyoku is a manga filled with friendship, love, pain, and sorrow that will touch your heart.

A collection of oneshots:

1) Chiki Chiki Banana
Two bold, hot and fashionist high school girls, Naomi and Jennifer must certainly have many perverted stories to tell...or so you'd think. But they are actually pure virgins! The two finally get boyfriends, and their hearts beat fast as they look forward to their first sexual experiences, but what happens when their boyfriends stumble upon a magazine where Naomi and Jennifer are labelled as 'Champions in Sex'!? A must read for beginners in love!

2) Dok!n
Misa and Yamato have been dating for a while but they haven't taken their relationship to the bed yet. Yamato prefers to take things slowly but when their friends push them to take the next big step, Yamato invites Misa to his house but will everything go as smoothly as they expected!?

3) Wild Card
Ikumi likes Kurata-kun, the guy she has been friends with since middle school but whenever she tries to confess her feelings to him, somehow or the other, Mami-chan interrupts her. So Ikumi asks Ken-kun, the most popular playboy in her school, to flirt with Mami-chan and take her away so that she can approach her crush Kurata-kun. Little did Ikumi know that her 'wild card' would actually turn out to be a 'joker'!!

4) Red Hot
Komaki has a crush on the Student Council President Amamiya-kun and so she becomes a member of the Cultural Festival Planning Committee to be close to him and to win his attention. She soon finds out that a delinquent gang known as 'Red Hot' is out to defame the President in public so as to ruin the Cultural Festival. Komaki offers to work as a spy for the President to get into his good books. Komaki is shocked when she discovers that the Council's Vice-president Kiichi-kun is actually the leader of that gang. Can Komaki save the President before it is too late?

5) Muki Muki Banana
Chiki Chiki Banana extra

Four years ago, Yuki's mother remarried to a man 7 years her junior, but due to mounting financial issues, her mother decides to divorce him and moves out. Meanwhile, Yuki realizes that she has feelings for her own stepfather?

Includes other works:
- Spring Rain Diary

Sawada Honoka is a 14-year-old girl who is very timid. She easily gets bullied by other classmates. Honoka is a non-believer in God, angels, and devils. Though one day, a devil baby was dropped into her room while she was sleeping. What will Honoka believe now?