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 twisted old man, gifted with extrasensory powers, silently holds sway over an entire block of apartments. The occupants are puppets for him to control. Life is his to give...and to take. But suddenly there is a new voice in his head, and before he knows it, a young girl with her own battery of psychic abilities has arrived to challenge him! Soon, the sprawling complex becomes a battleground between two minds possessing incredible, unimaginable power.
Note: Won the 15th Seiun Award for Best Comic (1984).

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!

The education system has changed its way of punishing students. If there is a problem now, the students go to court. But its not a normal court, its made out of students and preschoolers. Attorneys , prosecutors and judges are all students. Follow the case of Tento Nanahoshi as he and his attorney Abaku Inugami try to prevail the accusations of murdering the pet fish of the class. It will be a tough process as the prosecutor is the cute and rich Pine Hanzuki.

N/A

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?!

In the future (1998), Japan has fallen under military control. As young men are conscripted to help with the war efforts for longer and longer periods, Risa waits anxiously for her boyfriend's return...

In a future where cyborgs are more common than fully flesh and blood humans, a girl goes out to seek oil when her family's ration gets cut off. She needs to get it quickly so her grandmother's heart doesn't burn out, but no one has ever gone up above to the ration center and returned alive.

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 doujin telling a plausible background story for Kancolle. also telling The life of a destroyer.

The day of the coronation has finally arrived, but peace is nowhere in sight. The King is still under attack by a mysterious faction that is trying desperately to put an end to his life.

And this time around, the trials facing them might just be too great to overcome. His Majesty and his "Right Eye" both have secrets they're keeping from each other. Secrets that could tear them apart... And destroy the kingdom.

The events chronicled in this manga are also depicted in its own campaign in the Gundam: Meguriai Sora game for Playstation 2 (released in the US as Gundam: Encounters in Space), as well as a novel by Kazuki Miyamoto.

Some of the characters are seen briefly in Mobile Suit Gundam - Lost War Chronicles manga.

Note: A masterpiece collection titled Kidou Senshi Gundam Gaiden - (Uchuu) Sora, Senku no Hate ni... was release in 2015.

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?

Altered humans, Uno and Yuuna, takes on ARCA's deal to service their debt.