From TJo:
TJO's 8th manga is Suzuki Noritaka's Shikotama, a comedy involving demons and more demons and uh, a little bit of snowboarding.

The sexy demon Mako has been sent from the demon world with an ultimatum mission from her father: bring him the "Supreme Soul," or else! However, getting the "supreme soul" proves to be a lot more problematic than Mako ever imagined as her friends fight back and a group of rival demons show up...

The guy who's always been by my side... the distance between us changes...

She calls herself Sexy Voice. To most of the world, she's just Hayashi Niko, an ordinary schoolgirl - but when time permits, she lives a double life as a hired investigator/spy. To help her, she has recruited the rather unlikely assistant she calls Robo, a geeky lump of a man who doesn't really know why he feels the need to do everything she tells him to. He just does it. Together, the odd team solve a number of cases for Sexy Voice's employer, an aging gangster.

Nanami Sekai gets scammed out of every penny he has, left only with a pair of boxers and a 3,000,000 yen debt. He then meets a girl, Ritori, who offers him a deal that seems too good to be true: she will take care of his debt if he will be her captain and help her with her job.

[Note]
It seems that this manga has been discontinued because the author became incapacitated during serialization and was not able to keep 2 series running.

A story about a 212cm military otaku with "Sensha Otoko" as his handle name. Despite his huge and imposing appearance, he is actually very shy, and thus had no girlfriends. One day, he saves a teenage girl from being harassed and promptly fell in love with the girl. However, because he has no experience in romance, he consults his otaku friends on the web-board Eirei Throne-Channel for advice. This is the beginning of a True Tank Story.Sensha Otoko - A True Tank Story is a parody of Densha Otoko that was part of the moon.cinemas.jp 2009 April Fools' Day joke. The manga was published in the Type-Moon 10th anniversary book, it was written and drawn by Haruno Tomoya.

From Chibi Manga:

Uta thought that her homeroom teacher was a geek, but she saw him when he was dressed differently. Sensei was actually a handsome rock-n-roll singer!? Since Uta had always wanted to have a boyfriend, she threatened him to "go out with her" and she wouldn't tell anyone his secret! but she ends up really falling in love with her teacher..!?

Contains:

• Natsu wa Ginga no Ame ga Furu
Summer Holidays. She didn't want to visit her grandmother, who she is on bad terms with, so she spends O-bon festival alone like she wanted. (Only for watching the house though!) And the person who appears in front of Akari is...!?

The Hanzo Academy is not just a regular school. It holds a top secret class for ninja training reserved just for the elite. Only two girls made the cut this year, Ikaruga, a quiet but gifted brunette, and Katsuragi, a passionate and skilled blonde. Their personalities could not be more polar opposite and sparks fly even on the first day of class. Ikaruga, being a little bit ahead of the curve, outscores Katsuragi on every assignment. With tensions running high, how will these two ninja students work together when the time comes?

When boys put their hands in their pockets, it means they're hiding their feelings!" Chiharu has a boyfriend that is very, VERY quiet. At first, she didn't mind at all that he rarely spoke because she believed that she was fine as long as their feelings could be conveyed. Soon, though, she comes to realize certain things that makes her feel extremely anxious towards him... Why does he always keep his hands in his pocket?

From Bluebird Scans:
The gyaru, Hana doesn't like the person that sits in front of her, Nioka and Nioka also hates gyarus?!

1) Youth Survival
Summer camping trips are supposed to be filled with joy and laughter, but why is Kiriko so unlucky~~? At first it was that weakling four eyes, Kazuo and cutesy Hana-chan destroying the pork soup, but then they never came back after asking them to go pick up some wild herbs! Oh, fine! So she and Satoru went up the mountains to get them, but who knew they’d get lost too?!

2) Liar Love Letters
When Ritsu's boyfriend asks to break up, she complies - only to find that he's angry about it. To make her pay for dumping him so easily, he puts on a bet. Trick Ritsu into falling in love, and win a good amount of money. When she overhears this, Ritsu is determined to shoot down all the boys out to trick her. But what happens when she comes across someone whose lies capture her heart?

3) Sword and Heart: Dangerous Relationship
When you add the Japanese kanji character for heart underneath the character for sword, sword becomes the character for shinobi. Shizuru, when younger, had a crush on her very brave and handsome ninja senpai, and still likes him to this day. Things in her life get a little complicated when other ninjas decide to steal something valuable that her family is taking care of.

4) Never Dying Crow…!
Otokomae! Beads Club side story

About a sixteen year old girl who graduated in Australia and returns to Japan to teach English in a high school. The students are of the same age and so she has a lot of difficulties getting accepted by them.

Collection of short stories:
• Spring Egg
Chika’s house was actually just an old lodging house, but due to the location, her parents decided to turn it into a student dorm for the college students. One day, she meets her first love, Fujimori Tomohiro, a college student who will be living at her house! But, Chika’s mother had made him signed an agreement that he can’t go after Chika-chan?! How would their love bloom?!
• Sunflower Girl
Misaki likes Kenji but she doesn't have the courage to confess. Now that summer break is close, she plans to give him a love letter, but...
• Happiness Faces South!
Sakura used to like her sensei, but now that he has a girlfriend she decides not to like anyone else. Bon, a college student sees her playing softball and falls for her. Will Sakura be able to fall for him too??
• Prince and I
Mari has always liked her next-door neighbor Kaoru, but he always treats her like an old hag. Then Mari's sempai confesses to her. What will Kaoru do?
• 2 Block Honey
Satoshi's girlfriend used to be a crybaby, short and cute. That was a year ago! Now she's taller than him and likes to wear high heels. How does Satoshi feel?
• Spring, Air, Sunday

1-4. Seinen 14-sai / Seinen 14.5-sai / Seinen 15-sai / Seinen 18-sai
Itou just found out that one of his best friends, Machida, maybe kind-of sort-of likes him. He doesn't say it, but he did orgasm when thinking of Itou even as he was about to have sex with his girlfriend! Now, Machida has a complex about Itou and even kisses him, and Itou develops a complex about Machida because his first kiss was taken! On the edge of becoming men, will they figure out their feelings?

5. Neko ni Naritai
The son of an apartment manager falls for a tenant who keeps several cats.

6. Kakedasu Otoko
Two longtime friends sleep together and navigate the awkward fallout.

7-8. Hana to Ojisan / Boku no Ojisan
An author mourns the eigth anniversary of his wife's death, and comes to see his younger cousin in a romantic light.

9-10. Kanashii kara Janai
A sad child wanders into a tobacco shop, where a sassy shop owner gives him a cigarette. The boy and the shop owner become friends, and she helps him learn to make friends (including her grandson).

11. Seinen ?-sai / Extra

Nikumaru, meaning "meatball" in Japanese, is a seventeen-year-old student at Ninja High School, a special school for the training of ninja. He is short and chubby, but he possesses a super technique known as the "kamikaze", where he stirs up a whirlwind with his feet. The series introduces his many adventures and pranks as Nikumaru meets with his rivals both in and out of school.

Sasameki Koto is the story of Murasame Sumika, an intelligent and athletically gifted girl who just happens to be in love with her best friend, Kazama Ushio. Unable to confess her feelings, Sumika can only stay by her side and watch over her. After all, the biggest obstacle to her love is something that she can't change. It has nothing to do with the fact they're both girls; Sumika just isn't Kazama's type!

Kazama is only into cute girls and Sumika's cool personality just doesn't fit the bill. Much to her friend's dismay, Kazama is always eager to share news about her latest crush. With the duo's knack for attracting trouble, it looks like Sumika's trials have only just begun.

From Lovers Dream:

All too aware of being "just a teenager," Chiho is willing to do what it takes to confess her love to Somei-sensei, her teacher and the guy of her dreams. Still haunted by nightmares of a confession gone wrong years ago, she hopes for some high school romance... but wait, the nightmare himself is back, and he's going to her high school?! Things just got a whole lot more complicated for Chiho...

*Includes two side stories in volume 2:

• Suki Nanda Baka Yarou
• Unmei Nante Sonna Mono

From Blu:

Watch as the worlds of anime voice acting and high school hockey collide! The boyishly handsome Shino is greeted at his front door one morning by the seventeen-year old son he didn’t know he had. Suddenly pushed into the position of being a father and a provider, Shino starts taking on new acting jobs, including boys’ love drama CDs, and the separation between art and life narrows significantly when his new coworkers start taking quite a bit of interest in him! As if that weren’t enough, his son Nakaya is a handful in and of himself. An aspiring hockey player with a bit of an attitude problem, Nakaya has a lot of growing up to do, and Shino is in for the long haul.

The sidestory, Nayamigoto, Attara ne? is compiled in Koimachi tankoubon.

One day, cute little Tarepanda decides to go on an adventure. But after a few bad turns, he realizes he misses home. Will he find his way back? Or will he stay lost forever?

This little one-shot is simple, charming and cute. If you like sweet slice-of-life / adventure stories, do yourself a favour and go read it!

From Tokyopop:

Having been assigned by the human elders the mission of stopping a mystical plague that has afflicted the Youkai with madness, Genjyo Sanzo assembles his team of Youkai warriors, desperately hoping that the disease will not affect them. He sets up qualifying tests that will help him determine the loyalty and worth of Cho Hakkai, Son Goku and Sha Gojyo. The team then journeys west to rid the land of madness.

Mizutani Minato, a high school girl, has not fit in at her new school ever since she started attending a different school from her middle school friends. Her shy personality has kept her from making friends and engaging with her classmates. Through an unexpected turn of events, she joins the astronomy club in school, consisting of three students considered to be the weirdest and seen as outcasts in the entire campus. The club consists of Aida Souji, the smartest student in the entire freshman class, Kousaka Ranko, the second most brilliant and ridiculously strong, and Takigawa Youichi. They all have dreams of becoming members of NASA and studying the fascinating universe. The four kids of the astronomy club rename themselves “Soramiyo” a name made by taking the first letter from each of the members' name. Minato slowly learns through the Soramiyo club how to become confident in who she really is and the importance of having great friends.