Brothers Conflict manga focused on Tsubaki and Azusa.

From Senpai Scans:

I was gently touched by a warm hand. The words that waited in the corner of my heart. That moment held a spark, something not to be shared with anyone else. That's fine. It's because of that it's fine. Your happiness is yours only--... As the title states, a collection of tragic and gentle stories.

N/A

It was difficult for Yuki to have long-lasting love with anyone of her boyfriends. Now she falls in love with Shingo at first sight. He helped her nonchalantly when her separation from her boyfriend got complicated. Since he is five years older than she, his adult love excites her.

From Shoujo Crusade:

When she was young, her parents died in a car accident. Her only relative, her grandma, has also passed way. As such, Kiri is now alone and without support. On the day of her grandma?s funeral, an unknown young man named "Shiina" appeared before her. The truth was, her grandma had been funding this violinist...?

From Viz:

The comedy starts when the cross-dressing begins! The Kobayashi twins, Mego and Mitsuru, were named after historical figures, but only Mego has grown up with a taste for history. So when Mitsuru is in danger of losing his weekends to extra history classes, he convinces his sister to swap clothes with him and ace his tests! After all, how hard can it be for them to play each other?

But Mego can’t rely on just her book smarts in Mitsuru’s all-boys, delinquents’ paradise of a high school. And Mitsuru finds life as a high school girl to be much more complicated than he expected!

The "Special Crime Investigation Department 007" includes the most capable and extraordinary investigators. Fuyuki, who just became one of its members, is very capable, too. She is paired with Kuze, a cool and very bishounen detective.

This combination proves to be the most dangerous one the police headquarters had ever seen!

From Forbidden Garden:

Meet Ikeno Komaki --an ordinary girl with an ordinary life. Everyday is pretty much the same as the last, until today. Today she awoke from a strange dream hearing voices and has unexpectedly received an extraordinary new talent.

Mikina's father is the president of a modeling agency. Mikina was once a popular child model, but due to an accident, she developed camera-phobia and gave up modeling.

10 years later, Mikina's father's company is going through some financial difficulty. Mikina really wishes to be able to help revive the company, and one day, she received a mysterious lipstick...

In 1999 Angel lip won the Shogakukan Manga Award for the shoujo category.

From Chibi Manga:
A love-comedy story of a shikigami finally start!

Sakura is childish and doesn't get why everyone wants a boyfriend. A few days before the Christmas Eve, her handsome childhood friend suddenly kisses her and makes her heart race. What will she do?

From Chibi Manga:

Keeping a secret in her, Ayu went back to her hometown. She decided not to fall in love anymore, but....?

Story One: Otome no Sainou

Nakanishi Kiyoshin, nickname Onii-chan, is a 14-year-old, chivalrous heroine. She witnesses a guy, Kashiwaki Sachikana, being confessed to by another guy. The confessor gets aggressive, and Nakanishi steps in. After that, Nakanishi and Kashi-kun become friends, and then...

Story Two: Tsuki Iro Secret

Back in elementary school, Alice ("president" & "me" in the manga) met a boy who helped her out. Now president of her middle school, Alice meets a magical sorcerer named Lu ("mage" in the manga) who can't go back until the next full moon. All the students in her school dislike her and think that she is not good enough for the presidency. Where is the boy who helped her out?

Growing up in a single parent family, she longed to have a father and brothers. Imagine her excitement after hearing that her mother's remarriage will fulfill her wishes! However, upon arriving at her new home, she accidentally swallowed their family treasure and gains some unknown powers, even becoming her new "brother's" slave! From then on, her life began to change.

This mildly innocent oneshot depicts the story of 2 different high-school girls, Yuzuki and Akane, as they crash into each other at the school's corridor and wake up in the infirmary with amnesia. As a result, both of their current love relationships take an unexpected turn...

*Also includes three other stories:

• Baribari Lovers!!! -
A bittersweet high-school story depicting the follow-up between a cute but naive girl and a bad-boy delinquent who tramples with her innocent heart. You sway along with the main female--even when her heart breaks... You may have a undying urge to punch that gangster >.<

• Koimitsu

• 2U

Mireille is the daughter of a bakery owner and her twin brother Fred was adopted into another family when they were kids. One day a letter from her brother arrived, saying he was in love with another man's woman. She replied, challenging him to be a man and claim the woman as his.

Two months later, a beautiful young man named Richard, claiming to be a messenger from Fred, visits and tells her "I've come for you." When the bewildered Mireille resists, he proceeds to kidnap her! It turns out that Fred has eloped with the crown prince's fiance, and it is now her responsibility to impersonate Fred - the former Count of Bernhardt!

Kika has a crush on Agi, but what does he see in her?

For her brother Subaru's sake, Hitomi decides to take his place at an all male prestigious high school for a year until he recovers and is discharged from the hospital. She gets to the school and runs into a few strange guys on her first day, but as soon as she tells them her name - they are surprised and make her go to the Lion Club. Hiding the fact that she's a girl will be difficult enough and now she has to deal with this strange group who are forcing her to join their club because they all believe that in their past lives they were members of the Shinsengumi!

Description by LuffyNoTomo

From Kirei Cake:

Suzu is your typical school girl looking to live an ordinary school life...

...Up until she realizes that she's attending a school populated with vampires, who have the ability to attract and hypnotize women for their own thirst.

Then comes Akishiro, a relatively quiet boy but is a vampire, who attacks Suzu and ends up sucking up most of her blood, to the verge of death.

However, what happens when Akishiro develops a weird affection for Suzu, where he can't bear to see her being bitten by anyone else?

On the day of the high school exam, it fell before Chiyo, a boy like Light, General (Tasuku). I assume that he is bad, Chiyo... But actually he was a motorcycle racer. It's Chiyo, but the general is showing me a new world that I didn't know about.