1) Why is it This Painful?
Chiaki found out that her boyfriend had another girlfriend besides herself, and she ended their relationship while they still loved each other. A few years later, Chiaki meets up with the ex, Konishi, but she already has a boyfriend!

2) That's Not Love
Hirobayashi-senpai breaks up with Minako, and she complies because she's hopelessly in love with him, but that doesn't mean she's going to give up on loving him so easily. Her underclassman Shimanuki isn't going to give up on her just yet, either.

3) Sweetheart
Tomohiro breaks up with Kana, and she thinks she's okay, thinking that she could easily replace her feelings for him; but after deciding to act like nothing happened between them for a while, he comes back the next day and wants to walk home together, and they become just friends.

4) I Just Want You to Be With Me
Story involves a girl named Mami who initially believes that her relationship with her longtime boyfriend has gotten boring. To make matters worse, this cute guy at her workplace kissed her out of the blue one afternoon, which got her questioning her "love" for her boyfriend even more. So the classic thing happens... they break up. But is that all there is to it? She didn't love him, right?

5) Holding Hands (Joining Hands)
Hitoshi-kun has a secret girlfriend, whilst having and official girlfriend that he's been dating for two years. Will the secret girlfriend be okay with being second in his life?

Collection of oneshots:

1) Real Kiss by MIYASAKA Kaho

2) Mikansei no Futari by WATANABE Shiho

3) Hana, hiraku. by YUMACHI Shin

4) Boku no Kanojo ha Erokawa desu. by TSUZUKI Moe

5) Koisuru Honnou by MOMOTA Sayo

6) Yokujō Otome by MOTO Haruka

From Sugar Oasis:
Nobushina Naharu has always wanted to become a famous detective.
Her dream is to set up a "Detective club" at school, but the teacher requested that a club has to have at least four or more club members to be considered a club. So then, when she has finally gathered 3 other partners, she realizes that they are getting weirder and weirder one by one.

A prologue of this is found in Para-dice.

Those who want to sell their nightmares come to the antiques and knickknacks shop - Aries. The owner of Aries is a child incarnation of Baku, the dweller of dreams who exchanges priceless oddities and experiences for human nightmares... so he may feed.

From Miracle Manhwa: Jung Dan Bi accidentally collides into Top Model Jung Ee Dun, plastering a piece of her toast onto his shirt. Not having enough time to even take the blame she ran off telling him to...

About a frog and her master. Her sadistic master...

"You are... a vampire?" Lucian is just a normal strawberry farmer, and fate meets him with an injured mysterious girl who tries to steal his strawberries. As he tries to help her, suddenly, the wound disappears without a trace! Will Lucian be a victim to a vampire?

From DramaQueen: In a small kingdom where chivalry exists and heroes are living legends, an extraordinary adventure awaits a young princess--Nan-Fan, Princess of Tang: young, naïve, and strong willed. On the eve of her arranged political marriage to the brutal "Battle Demon" of the rival Li Kingdom, she escapes from the imperial palace to seek her true fate. On this journey, she begins to understand the joys and hardships of the common people and realizes that living outside the palace can teach a young princess how to become a person of strength and character. Thus, undaunted by the unknown, Princess Nan-Fan forges ahead, reshaping the myths and legends of her own destiny.

[From Twinkle-Dust]:

Jiyoo is a beautiful girl, who has yet to have her first kiss. Handsome guys, who Jiyoo only saw as friends, are now competing for the fair maiden’s love. Who will win over Jiyoo’s chaste heart?

Collection of shorts stories featuring characters from the otome game Starry☆Sky ~in Winter~

An anthology containing oneshots, each featuring another pairing

Mirai Yosouzu - Future Predictions Chart by KIRIKUCHI Karashi
Tsukiko is in the library searching for books about tea ceremony, so she can get closer to Homare-sempai. But then sempai shows up... How will he react?

Tea Time by CHIDORI Peko

From ShoujoMagic:

There's a rumor that high school freshman Aki is involved with Masanari, a candidate for student body president next term. Aki thinks of Masanari just as her best friend, but to make sure of the matter, Masanari's younger twin brother Naoya appears! Aki begins to be seduced by Naoya's forceful manner...

Then one day, Masanari collapses. When Aki goes to wish him well, she's relieved to see that he's okay. While she's there, though, Naoya asks her out on a date, and he's being much gentler with her than usual. Aki musters up her courage and tries to tell Naoya how she feels, but not only does Naoya do an about-face and command Aki to date Masanari instead, but another girl confesses love to Naoya right in front of her!? What's Aki going to do...??

Contains sidestory: Body Music

When Yuuki first meets Akihisa she is less than impressed. Not only is he stalking her, but he also tries to seduce her knowing full well she's a high school student who already has a boyfriend. She can't stand him at all so why is she so drawn to him? On the surface Akihisa seems like the worst kind of man... Is he just toying with Yuuki or does he really care about her?

She was in the 3rd grade of middle school, he was in the 1st grade of high school. She met him at the basketball match for the first time. He was so amazing, she fell in love at first sight and decided to enter the same high school he's going to. After she managed to get into Shuuei Institute, she expects her happy love life to begin but... what if the guy she liked was held back a year?! And what if he told her to "never come near him again"?! No worries, Tachibana Riri will not give up!

From Cibi Manga:

Sanae, positive minded and super beautiful, always popular among men, and Taishi who is the ace of Track&Field casually gentle with girls and popular among girls. Ordinary girl Yui, is proud to be both of their childhood friend. Yui had feelings for Taishi since a while back but kept to her heart since she didn't want to break the relationship that the 3 had. One day, Sanae told Yui "I love Taishi" Yui promise's Sanae that she will cheer them on and....?!

Includes one-shots:

From Shoujo Crusade:

Suki dake ja Wakaranai
Fujisaki fell in love at first sight with Nakamura-kun after he helped her out of an embarrassing situation. Fujisaki wants to be more lovey-dovey with Nakamura-kun however he is known for being the ‘antisocial king’!!!

Darling I Love You
Chiho has always loved Ryouhei but Ryouhei has never even shown a hint of liking her back. What does Chiho have to do to make him turn her way, even if it’s just a little…

Hinata Asahi is a high school student who lives alone with only her teddy bears to keep her company. Her life becomes much more exciting when the handsome Shirou Asou, moves in next door -- not only is he really cute (even if much older), but he's also her new teacher! Hina has a bit of a crush on Asou-sensei, but when the older man seems to take an interest in her as well, is it a forbidden love or something else? (Source: Tokyopop)

The world is threatened by Mephisto, the King of Minor Land, who tries to spread the Melody of Unhappiness. Mephisto is after the Legendary Score, in which the Melody of Happiness is written. In order to complete the score and protect the world, new Precure girls stand up to collect the scattered notes of the Melody of Happiness.

Collection of five short stories
Sara can only see her stepbrother Natsu when he comes back home once a year. Each summer feels the same but something will happen in this one. This story shows how their relationship as step siblings in the past affects their present.

From Mahou:
While working at the Cafe her parents manage, Saho has fallen into [unrequited] love with a regular customer named Kagami. One day, she is determined to make that fateful confession, but!?

Contains one main story, and a few oneshots.
Story 1 - A girl who has always put studying as her main focus in life, now finds she wants a boyfriend. But will her high scores make the guy she likes feel inferior...? And this guy seems to be the ex-boyfriend of the most popular girl at school! Is he really a player...?!