From RebelliousArt:

Maki has a problem. After letting Wada stay at her place for the night, she can't seem to get rid of him. What was supposed to be a temporary stay is turning out to be much more. Not only that, but as a man and woman living together, there's bound to be some activity going on beneath the sheets.

From: Easy Going Scans
High-school student Jinpachi Kogure is a member of the manga club and is no good with women. Yumika Testuyoshi is a troubled female high-school student who's always skipping school and searching for a girl she doesn't hate. However, these two are in reality young masters of the art of killing people:"Young Guns.

The main protagonist, the shy Jun Naruse, is a rather average guy who works for a electronic company and loves to draw. He falls in love with Megumi whom he met at a shop selling drawing materials and an intimate relationship develops. A few days later the office gets attacked and when the criminal tries to shoot a little girl he saves her by jumping in front of her.

A month passes until he wakes up again and is told that half his brain got destroyed and he only survived because someone donated half a brain. Everything seems to be fine, he quickly recovers and is happy, however he begins to change... is the donated brain the reason for that? Or is it just a side effect of the medicine?

One-shots included in volume four:

• Area
• Yasokyoku - Nocturne
• Body

[From Blu]:

Shusuke has just been reunited with his best friend from high school, Atsushi, after many years apart. The problem for Shusuke is that Atsushi is his secret crush he’s been trying so hard to forget about all these years. Will Shusuke take this opportunity to finally reveal his feelings? And just what are Atsushi’s feeling for Shusuke?

The shogunate installed by the Tokugawa is abiding order, the people live in peace and in a relative prosperity.

However, the dark part of the human heart does not cease to arouse their cupidity : it is the ideal doorway for all demons that, by possessing humans, seek to pass into their world.

Exorcising these demons is Jonosuke's mission, the master of keys. Known for being the best locksmith of Edo, Jonosuke uses particular locks to put the wicked spirits under lock and key. With the help of the bewitching O-kin, a divine who uses unorthodox methods, Jonosuke is going to meet during his demon hunt some notables of his time, who will prove to be precious allies when he faces a plot aimed at the upper spheres of State.

From Attractive Fascinante:

Aratsuka Kaoru, a math sensei teaching in an all boys’ middle and high school boarding school, is also known as “Alaska” because of his coldness. He has never been in love before because he’s afraid to share his feelings with another. After some issues, he spent a night in the room of the infirmary sensei, Suzuki Kouta. It was the first time someone touched him. What will happen thereafter?

From Aerandria Scans:

Rinko is an ordinary girl who was born with a mysterious birthmark on her left arm. But when that mark starts to get darker, strange accidents begin to happen everywhere around her, involving even the people she cares about. What will the powerful magic awakening inside Rinko bring her?

In 1987, Purple Eyes in the Dark was awarded the Shogakukan Manga Award for the shoujo manga category.

Later it got a continuation: Yami no Purple Eyes - Bangaihen - PANTHERS.

Junko Tachibana, a manager of the baseball club of Wakaba High School, is the Madonna of the team. Sawamura, her first love, is an ace batter.Happy and sound love story.

*Included in Aa! Seishun no Koushien

From Attractive Fascinante:

In the Royale School, because of his nice name, Ayamoji Kokuei was being targeted by a yakuza’s son, Shirogane Michihiko (real name: Kintarou). Ayamoji began to skip lessons and repeat grades to avoid meeting Shirogane. When they met six years later, Ayamoji drugged Shirogane and they got intimate. Ayamoji left after that and reappeared five years later. Would the two lovebirds finally be together?

From Tokyopop:

Chiyoharu used to be the leader of the troublemakers, until one day an innocent prank results in a major fire at the school. When his three cohorts take the blame and are expelled, Chiyoharu tries to go on with his mundane life, beating himself up with guilt. Then he meets the mysterious, muscle-man Souza of the North Wind and a ditzy self-proclaimed detective who are trying to solve the mystery behind Souza's amnesia...It's nonstop comedy and action from there!

Atop the mountain, there lived a deity with a tiger in his household. A fair maiden ventured alone... to see the deity of the mountain.

The head of a village plagued by a man-eating tiger offers his daughter Hyeon-na to any man who successfully disposes of the tiger. Dismayed at being treated as a trophy, Hyeon-na sets out alone to the mountain where the tiger lives...

A spin-off of Working!! Collected as part of Working!! volume 10 during tankobon release.

Ashihara Chihiro is a regular high school student. One day a man came to her and told her that she's actually a princess from another country in another dimension. Chihiro later found out that it was true, and in fact her own best friend and teacher were actually her guardians! Her country has been taken over by Raja, who is now king. Chihiro and her guardians come back to that dimension to take back their country. In her quest, Chihiro met other guardians and warriors who were willing to help her achieve her goal.

From Shinnen:

There are rumors of a grand treasure located within the local museum of Ashiwara and that this treasure requires a special key to unlock. But no one seems to know what this treasure is or even what the key looks like.

But Kei and Hikaru, two childhood friends, may inadvertently find out when someone seeks to claim the treasure for themselves and that action plunges their world into chaos.

From Manga Jouhou:
Takashi Sone is living on his own while he is attending college. Out of the blue, his parents tell him that his sister, Mafuyu, is moving in to live with him and that she will be attending a high school in his area.
When she arrives, he finds out that she was kicked out of her old school for getting caught making out with another girl. Soon afterwards, the other girl arrives, having thrown away everything she owns in order to run away and live with Mafuyu.

Volume 11 has a unreleated 2 chapter story at the end called Frills

A collection of oneshots: Story 1: Spring and Love Come Early? Ichio Tomochika, the archery club president, likes the calligraphy club member, Komada Aoba. With black hair and black eyeballs, Komada is just like a stubborn black cat. Looking at such an adorable cat everyday, Ichio hopes Komada can sense his feelings he has for him. After an unexpected kiss from Ichio, will Komada return his feelings? (From Attractive Fascinante) Story 2: The Trap of Love Story 3: I Want A Bit More Love Story 4: Youth Melancholic Story 5: While Numbering Stars Omake: While Numbering Stars Extra

While walking home from work one day, a doctor named Shuichiro notices an angel, Kohaku, stuck on a tree while being attacked by a crow. He rescues Kohaku and, in return, Kohaku offers to grant him a wish. However, Shuichiro is satisfied with his life - he has a decent home, good looks, and a well-paying job as a doctor - so he does not request anything. As Kohaku is honour-bound to grant the wish, she chooses to stay with him in his home, and helps with chores.

From Sweet Lunacy:

Armelia is an orphan girl who sings for work. One day, she met a boy, Luce, and fell in love with him. Unfortunately, Luce was kidnapped by the notorious pirate, Scar. Armelia swore to herself that one day she would rescue Luce. But the truth is not what she thought it was...

*Includes a side story called Haru wa Sakura:

Shou wants to be a doctor, but female doctors are forbidden. Takao is a delinquent, whose bad reputation is known by many. Somehow these two people cross paths and a connection is made. Was it just a chance meeting or will something more come out of it?

[From: InfinityScan] Anna, sweet, kind, and an angel, as Ou Bin describes, was always being bullied by Oc Ja Gang to the point where she has to rest until she recovers. Though, there are these rumor going around the school that Anna is coming back. Ou Bin, excited about the news rushes to go find her but...what he sees is someone else and not the sweet Anna.

From TachiNeko Guild:

Set in post-World War II Japan, this is a story of young Haruomi, an heir of the prominent Morimura family. Stripped of his aristocratic title while facing a repossession of his estate, Haruomi finds himself thrown on the mercy of a wealthy Japanese American, Tsutomu Oshio.

At first, Oshio wants nothing to do with a naïve noble. After all, he hates the Japanese above all else. Yet as the days go by, Oshio finds himself inexplicably drawn to Haruomi’s innocence. Driven by a desire to rid himself of his newfound feelings, Oshio sets it upon himself to disrupt Haruomi’s flawless façade.

Through the hope of saving his bedridden mother’s life, Haruomi accedes to Oshio’s scandalous demands to become his “servant”. Thus, Haruomi’s new life as his master’s plaything begins…

Note: It sounds like the Japanese version of this title included a separate one shot about a host club. While the version published by Enju Group does not.