Related:> Diabolik Lovers Prequel ( http://www.batoto.net/comic/_/comics/diabolik-lovers-prequel-r10050 )

1-3) Shiranu wa Omae Bakari & Kare no Mizo Shiru (from Echochi Scans)
Yoshikawa Taiki and Komiya Kazuyuki had sex once almost every week, but they were neither lovers nor friends. What started off as a drunken escapade back during a university get-together scaled into something bigger than either of them could have imagined. Though he wished for more, Kazuyuki felt that there was no hope for something deeper between the two of them, because Taiki was as straight as a ruler. For someone like Kazuyuki, who knew that his sexual orientation wasn't generally accepted by society, he planned to give up and stop whatever sexual relationship he had with Taiki. But what’s Taiki’s say in all this?

4-5) Dakara Kao mo Mitakunai & Nano ni Te wo Furarenai
After getting dumped, Kataoka Takeru's best friend Yui confesses to him. But Takeru doesn't know how to cope with this situation. What will become of their friendship?

From Pinoymanga Scans:

In the 24th generation of Kings of the Joseon Dynasty, a boatman known as Seo-mok unknowingly helped a mysterious woman and Japanese spies who were disguised as rich Korean men to cross a river. But after crossing the river, they tried to kill Seo-mok... Left with no choice, Seo-mok then took the woman hostage--and soon, secrets began to unfold.

A story of a man and a woman undoing their curse.

Onda Nozomi is in her second year on the middle school soccer team but has yet to play a single game because she is a girl. Growing up playing soccer, she has the technical skills, endurance and the elegance. However, as a girl, she can’t overcome the physical difference and she can see all her male teammates that she grew up playing soccer with get further and further away from her. Even her younger brother, Junpei, who is also on the team, is starting to rise above her. Coach Samejima sees that Nozomi is an amazing player but because soccer is such a physical sport, he can’t let her play. Nozomi isn’t the kind of girl that just gives up so she practices harder than anyone and drives the team in the hopes of one day playing in a game.

Aritake Deigo has decided to move out and go live on his own no matter the cost. The reason for this is that he can no longer stand living with his family anymore. All he wants is to find a place to live a miserly life of self-loathing. While talking to an apartment agent, he encounters a strange blue-haired girl carrying a snake statue. When he starts hearing a faint voice come from the statue, he grows curious and touches it. A blinding flash of light ensues and he loses consciousness. Upon waking up, he finds out that he has been possessed by Lyssa, the Goddess of Madness. As a result, if he doesn't live a life of happiness, he will be taken over by the Goddess of Madness and die!

Kamiyoshi Hina is a new transfer student. She was looking forward to spending her school days with peace and ease. Unfortunately, that thought flew out the window when she was appointed class representative and seated next to the school's infamous delinquent, Mikuni Satoshi.

According to rumors, Mikuni Satoshi gets into fights and spends the nights working as a gigolo. Are there any truths to the rumors? What will happen when the two meet? Is there more to Kamiyoshi Hina's cheerful demeanor and Mikuni Satoshi's delinquent behavior? Read to find out!

Liang You Xin is a kind and innocent girl who has left home to further her studies in the Tyrol in Europe. During her travels, the seemingly innocent act of helping a stray pig sends her to a different dimension in the Royal Palace Museum. There, she meets a mysterious young man clothed in black who invites her to the Royal Palace as a guest. Expecting to find an abandoned palace, Liang You Xin is surprised to find Tyrol’s 17th Century Royal Highness instead. This fateful encounter changes her life from one of scholarship into slavery… - from Allinav

From Ultimate Manga guide:

Ibuki Morisato dreamed of kissing a prince turned into reality when her dream prince appeared as the new transfer student?!

After a fairly futile attempt at capturing the heart of Jinnai, Kijima finds himself dealt with a lucky hand once again.

One day, dazzled by the pattern of a beautiful kimono, he suddenly finds himself enchanted by the talent behind its simple genius. Just how far will he go for such a lovely masterpiece?

A cat falls in love with a human who once took care of him. Wanting to stay by the young man's side, he agrees to a deal that would allow him to take human form--except in the eyes of the one he has feelings for! What will become of this love?

1) Usotsuki Ookami
Satsuki is a counselor at a prestigious boys' high school. In fact, she is an ordinary high school student. Though she wishes that it will not be revealed, Tsuburaya, a problem student of the school, hangs around her...?!

2) Miscalculation of the Little Demon
His Family is about reach as mine, but he is 9 years older and already turned me down. then why is he here again?

3) Together with Doggie
They are interested in me because of my face. I'm tired of younger boy's confessions but this dog like boy won't leave me alone ...

4) Deli Bunny Girl
Working in a cosplay cafe for bunny ear maniacs when I'm just a high schooler! He find outs, what should I do now?

5) Non-sugar Darling
We've been dating for 1 year now, but it looks like there is no love anymore.

From Omari's Sister:
Yukari, at the tender age of 17, is a renown Edo period novelist who claims visions of Yoshihara during the Edo period gush from his heart. After meeting Mahoro, a girl he swears he knows and has met before, Yukari finds himself falling asleep and waking up in the Edo period as an Oiran. The past and present collide in this time traveling romance.

From Summer Rain:
Between three highschool students, a secret love affair begins..

In the Kincaid-ka no Yuigon Game Series (The Payback Affairs series):

V.1 - Boss to Hisho no Juunikagetsu (Shattered by the CEO)
All's Fair In Love...And Business

CEO Rand Kincaid had never been coerced--until his entire future was at stake. Under the stipulations of his father's will, Rand had to rehire Tara Anthony as his assistant. It was either get along with the one woman who'd dared to leave him first, or lose his family empire.

But before Tara would accept, she gave Rand her own demands. She wanted a second chance, with Rand back in her home and bed as her lover. And nothing prepared him for where this arrangement would lead.

V.2 - Itsushika Hanayome Kouho (Bound by the Kincaid Baby)
The affluent Mitch Kincaid's livelihood hangs in the balance because of his father's peculiar will. Unless he takes in his father's illegitimate child and looks after him for one year, Mitch will lose his entire fortune. The child is now under the care of its aunt, Carly. "I'll give you a hundred grand for the child. No-five hundred." Mitch offers Carly riches, but she refuses. She claims she doesn't need any money, and that she'll only cooperate on the condition that she, too, lives at the Kincaid manor. Dammit, what is she after? Does she intend to slink into his bed - and push him into marrying her?

V.3 - Nefuda Tsuki no Ai (Wed by Deception)
Ever since her husband died eleven years ago, Nadia has been busy playing and working to take her mind off things. Now, according to her father's strange will, Nadia is to shut herself in a Dallas penthouse. Her curfew is at midnight and she is not allowed to see any of her friends or go to work. If she disobeys these conditions, she will lose all of her inheritance. What is my father trying to do by keeping me locked in? Two months after this lonely and depressing life started, her penthouse neighbor, who has been away, suddenly appears in front of her. But the minute she sees him, Nadia faints out of shock!

English version via Renta!: Vol 1, Vol 2, Vol 3

After Shiori loses faith in her piano playing, she meets a weird Physics Professor who asks her to teach him to play the piano.

Mira attends a private school in England and finds out that the boy who appears in her dream since her childhood really exists. He's Radley Macchiavelli, a beautiful model. When the two finally meet, the boy is transported to a parallel world connected from one spiral ("Rasen"). Mira follows him to try to save him and is swallowed into the parallel world dominated by the mysterious Black King...

From NOIR:

This is the story of two siblings, Joo-won and Hee-won, and one man determined to take Hee-won's heart. Both Joo-won and Hee-won feel isolated after their parents separate due to infidelity and remarriage, placing both of them in new families. However, Hee-won's new step-brother, In-hyuk, notices Hee-won's suffering. Is he determined to take care of her, or is there something more?

An alien species wanted to start a revolution against their oppressors, and they think they may have found the power in humanity to accomplish their goals. They discovered that humans have latent superpowers, and so they began to abduct them and awaken their abilities. Unfortunately, the humans' abilities were not very useful for their purposes---at least not until they found the destructive power of #214.
#214 is actually a young woman named Hoshi Yumako, who has no interest at all in the aliens' revolution. The abduction and powers have seriously screwed up her life, and all she wants is to be able to live a normal life. Pursued by the aliens, she tries to work part-time and keep her powers from ruining everything. However, she knows she's not the only one out there; she might find allies among the empowered rejects of the aliens' experiments.

Prequel to the Gundam Build Fighters TV anime, covering how Yuuki Tatsuya got into Gunpla Battle.