Two high-school students who have been friends since childhood have a complicated relationship.

Two souls are linked by a heirloom rose garden.

From Midnight Scans:

After my Mom got married to her second husband, it made Chinatsu my younger brother. At first, I thought he was surely a perfect brother after seeing his angel-like smile, however, the truth is that he is really a pervert and very ill tempered! I was surprise when I found out my angel-like younger brother is really a little devil?! Will I just allow him to abuse me?!

Includes:
Koakuma Kiss (Kiss by the Small Devil)
Motto Koakuma Kiss (Kisses by the Small Devil)
Motto Motto Koakuma Kiss (More and More Kisses from the Small Devil)
Koakuma kiss -Again- (Kiss by the Small Devil -Again-)
Kimi no Junjou, Otome no Jijou (Your Pure Heart, Maiden's Situation).

Kouya is a brilliant, yet antisocial, research student at a medical university. He has no need for friends and brushes off even the gentle fellow student Rei, who admires him. But Rei's not the only one interested in Kouya, professor Katase started to make his move and there are very bad rumours about him...  

Rikuri and Ron and their adventures with the non-human side of their school.

Yashi has wandered with her father for fourteen years, and only now has she discovered that her own mother is actually Bocinia’s current queen. To see her mother, from whom she was separated when she was just an infant, she and her father enter the palace, but she never thought she would accidentally run into the Princess of Bocinia, and then become her bodyguard by mistake...

NOTE: This manhua ends at Volume 4. The continuation of the story was written in a novel.

From Shinnen:

Emi and Atsushi have been dating for one month now, and to be able to become one with the person you like is like a miracle. The feeling of happiness is overwhelming, but apparently, there is an unforgettable person for Atsushi. What should a person do in order to make his attention turn to one's self? An earnest love graffiti.

Other stories:

Shin Sekai
Iroha ni Hoheto
Omoware, Omou

THE BILLIONAIRE BOSS'S FORBIDDEN MISTRESS

Blessed with brilliant beauty and abundant wealth, Lena used to be a princess of the high society until an accident took everything away from her, leaving only an ugly scar on her leg. Moreover, her husband despised the scar and dumped her. "I'll never trust a man..." Since then, her smile disappeared from her face, she withdrew and lived a quiet life. She never expected her extremely sexy boss to be determined to make her his own.

English publication via Renta!

From Fantasyshrine:

Kikuchi Yo, a travel agency owner dreams of turning the "Blue Rose", a British noble mansion into a hotel. He enthusiastically approaches Baron Gilfred, owner of the mansion, with his plans. Unbeknownst to him, he's walking into the Baron's trap…! A gorgeous love story between a nobleman and a business owner.

Nakanomori Yuzu's family used to run a dojo. But when the Tenmonzaki family opens a rival business next door, they went bankrupt in a blink of an eye. Her parents died in a car crash shortly afterwards, leaving Yuzu and her brother in poverty, struggling to pay off their debts. Yuzu, in search for revenge against the Tenmozaki family, swears to defeat their son around her age: the rich and talented Tenmonzaki Yuu. She enters the elite National Tamateba High School in order to fulfill her goal, but finds that first impressions are not all what they seem- especially concerning Yuu. From NOIR: Our poor female character is a poor girl with a debt to the rich and powerful Tenmonchiki. She accepts to be a slave in order to pay off her debts but what are these feelings starting to bloom within her heart…? Could she possibly love this rich, arrogant and all too perfect guy?

(If I can make money, I will do anything)

I can sell (give up on) my love, or risk my life.
You want to use me as a tool to revenge your little brother [or sister]?
Here, I will be used. Buy me.
I am very expensive.

Eun Hyool, you said you will do anything if you get paid?
I will buy every single piece of you.
From now on, you are my slave.
But, I will refuse your heart.

These two are getting used to each other by endlessly running against each other.
Love that formed through quarrels is risky like a flower at the end of a cliff!

A collection of stories that revolve around a certain kingdom.

1. Love Came Dancing Down + Extra
Even before he was born it had been decided that the heir of the Haku Family, Reion, would be betrothed to the youngest child of the Koku Family, Kaen. For his coming-of-age and wedding ceremony, Reion visits the House of the Koku Family. However, Reion was no longer the boy he first saw in pictures, but a man overflowing with confidence. Furthermore, Reion left the words "I am as appalled as you are about this wedding between two men." - Blissful Sin

2. Oriental Gorgeous Legend - First Story
A young boy from the Sei family, the land neighboring Koku, wanders into the Forbidden Forest and discovers an injured man lying in the flowers. Both strangers are shocked at the appearance of the other - the young Sei boy, Renju, with violet eyes and black hair and the platinum-haired Katsuragi with sharp facial features. The two strike up an unlikely friendship, and Renju discovers that he is a rare person who can cross a barrier that surrounds the forest. The ancestors of the two families had feuded since long ago... but can Renju and Katsuragi endure the obstacles and keep their friendship?

3. Oriental Gorgeous Legend - Second Story + Extra
After catching a cold while waiting for Katsuragi and recovering on Katsuragi's side of the barrier, Renju's grandfather forbids him to leave the manor but soon collapses from the stress. Renju's uncle returns to see how the two of them are doing, and ends up explaining everything to Renju... a complicated past that Renju and Katsuragi share. When Katsuragi suddenly appears on Renju's side, things become even more complicated. Will the two finally be able to stay together?

4. Story of Love + Extra
Shion, Reion's older brother, suddenly became the head of the Koku family when their eldest brother died. But for him, there was only one thing he wanted: to bring his old bodyguard Gii back to his side. Things take a bad turn when Gii refuses violently... but it seems that Shion might have a bit of a masochistic streak?

5. Flaw of Paradise + Extra
When Shou's house was attacked by rebels, he watched his father be killed in front of his eyes... by the hand of his trusted companion Nachi. From that moment, Shou spent his days betrayed and raped in a small room, locked away from the world. His paradise had been taken away by the man he trusted the most.

From Attractive Fascinante:

Shouji was upset when Shimazu cancelled their appointment. Minami approached him and told Shouji that he knew that Shouji was having an affair with Shimazu. Shouji denied it and Minami asked Shouji to let him stay over at his house for the time being. With Minami stepping into his life, would Shouji finally let go of his tiring love with Shimazu and accept Minami?

Under the umbrella, my feelings pour down like the rain...

Igawa and Takagi work in the same company but do not get along with each other. Igawa thinks that it all started when Takagi collapsed during training retreat and Igawa insisted on carrying him to the infirmary which hurt Takagi's pride. Now, their boss has threatened them to either start getting along or else their bonuses will be withheld. How will these two ever get along?!

From Alice Dreams:

Shiina is a rich daughter of a business man who went bankrupt. She lost her house, and her engagement was broken off. The only thing left for her is a club that was left in her name. Having no idea of what the club is, she visits it, and manager Ryuichiro comes to meet her. She soon finds out this club might be far more than a girl brought up in high society can handle!

From Rosa Negra:

A Prince Charming suddenly appears in front of a country girl on a remote island.
"I love you, I want to be happy with you like this forever."
Setting a foot on a strange city to find her Prince Charming, she finds out that he is actually the Entertainment Industry's top star, Gang-Woo Choi.
Even after seeing her, he pretends as if he doesn't know her...!!!
"Gang-Woo Choi! You dare play around with me? I'll never forgive you!"

Brother always reject girls around him! Despite having an ideal boyfriend by her side, his charm is still not enough to attract her, because he is always by her side...

From Impossibility:

Yoshida Miake is a charismatic first year high school student who is in love with her best friend whom she has known all of her life. The only problem is the fact that he has no interest in her whatsoever. Heartbroken, she finds comfort from "Mr. Black" and slowly begins to develop feelings for him. But how can she develop a relationship with a person who exchanges kisses for lunch?