From Angelic Powder:
The princess of love, Koiko is given the power to zap people to admire her but the power will leave her when she reaches adulthood and marries. There was one boy she had never zapped before, Shirou. But he turns out to be someone different when he doesn't show up as he promised. Koiko being heartbroken runs to find him, only to find new things she never knew about him. It turns out he is one of the legendary shadow ninjas.

Touma Outa wakes up from a bad dream one morning and when he sees his reflection, there are horns growing out of his head. Suddenly, he is pounded in the head by a cute, hammer-carrying knight from the demon world. The horns shrink, but he is not off the hook yet, for the little knight, Pukateriosu, is there to prevent him from transforming completely into the Demon King whose soul has entered Outa's body. The PukaPuka hammer can return him to normal but it takes time to charge. In the meanwhile, Outa must try not to think worldly thoughts or be kissed, but it's easier said than done with his crush Shirayuki Himeka, the little demon Garbelion, and even Pukateriosu around...

1) Atelier
Art student Ritsu takes on Tagami, a teacher with a bad attitude.

2) Mad Dog Breeder
Kusugawa wants to discover what his coworker Oka means when he says he get "desperate" when he drinks.

3) Longing for the House Guest
Haruka and Jun are roommates and novelists. After Jun's sloppy housekeeping causes Haruka to injure his hands, guilty Jun needs to help Haruka any way he can.

4) White Snow, Black Wings
Ex-prostitute Mizuki and mafia assassin Katsuhiko are on the run from their former bosses, but Katsuhiko is sick.

5) Milk
A young man has a guy who wanders in and out of his life like a cat.

6) Twilight Amusement Park
Teacher is dating his student, Yoshii, who wants to quit school and work in an amusement park, but Yoshii's family wants him to study abroad.

7) Haruhi
His young patient dying of a mysterious illness, a doctor takes him on a trip to the sea.

A lonely lion falls in love with a kind human girl and asks a witch to grant his wish to become human. But, will the lion lose everything, or find true love?

1) Lost Children
Koyo Tomohiko and Fukube Naoto are childhood friends. But when Naoto gets a girlfriend and doesn't have much time for Tomo anymore, Tomo's pissed! But is friendship the only thing Tomo feels?

2) Diamonds are Forever
Taki Chisato and Kamitori Taichi have been goofing off instead of studying. Now their tutor, Taki's cousin Atsushi, is punishing them for wrong answers... by making them kiss each other?!

3) Continuation of Diamonds are Forever. Chisato and Taichi are dating, but Taichi wants some of the physical benefits of dating.

4) Golden Star
Third year junior high student Murakami finds himself watching stoic classmate Takahashi play the piano every year for their school chorus. But Murakami really likes Takahashi's voice and wants to hear him sing.

5) Flower Scented
Mushano Kouji is a master wizard who teaches magic to children. But when 36 year old Sakurada Tsukihito asks to be his apprentice, Kouji doesn't send him away. Sakarada is hopeless with magic, but great with housework, which is just what Kouji needs, but why does this man want to learn magic so badly?

Sherbet Lemon and Covenant of Darkness:

The snow mountain is his territory, no one is suppose to live there! Who is this daredevil?! How dare he chop off my favorite gingko tree. To make it worse, he took all the furnitures in my cave! Darn! I won't be a demon fox if I didn't take revenge! But... he's just an idiotic scholar, why can't I get close to him? When the mischievous but innocent snow fox meets a slow yet scheming scholar, the truth isn't what Xue Qiu expected.

From Aerandria Scans:
In this grim and realistic take on classic fairy tales, Prince Ludwig, a female corpse collector, is ordered by his father to find himself a wife more suitable than the women he often brings into the castle. Along with his servant Wilhelm, they travel across the land in search of fair maidens from classic stories in hopes of finding Ludwig a wife.

A new twist on the "love doll" genre. Tempted by an internet advertisement for a "Necoco" doll series, Eiji orders one on a whim, imagining a moe-tastic hadaka-apron-wearing girl to show up on his doorstep. Instead he gets a scrappy looking boy, and to make matters worse... he's an aggressive, tough-talking little brat.

Also contains a oneshot called Good Awakening to The Master.

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Love Neko (New Edition 2007, 16P additional!)

Shiino Tazumura is a bit of an odd girl. One day in a park, beside what is rumoured to be a haunted house, she discovers a beautiful dog injured behind the bushes whose wounds she tends to. The next day, a beautiful boy resembling the dog shows up on her doorstep...

Mazinger Angels chronicles the adventures of four women who pilot giant robots in the Mazinger vein. The concept is a spoof on the late 70's and early 80's popular TV series Charlie's Angels.

Three of the robots, Aphrodite A, Diana A and Minerva X are from the original Mazinger Z series, while Venus A is from the Great Mazinger series. Their pilots are also traditional characters from Go Nagai's universe, Sayaka Yumi and Jun Hono from Mazinger Z and Great Mazinger respectively, and Hikaru Makiba and Maria Fleed from Grendizer.

The style of the manga highlights the sex appeal of both the characters and the mechas, sometimes similarly to the way Aika's female characters are shown. (taken from wikipedia)

The Norse god of mischief Loki has been banished to the human world in the body of a young boy. In order to redeem himself, he sets up a detective agency and dispels the evil residing in people's hearts. He is joined by Mayura, a spiritually clueless high school girl with a passion for mysteries, and eventually, other Norse gods begin appearing around Loki for unknown reasons.

Marichen finds herself in a different world when she wakes up. The only way to get back home seems to be finding three elements and bring them somehow back to her dream. The three elements are: Peace, Compassion, and Eternity. Her adventure to seek them out begins, or not.

Note:
The plot is very much incomplete, but the author made a note in the end of the book, stating that she is fully aware of it and that she had to end the series due to some issues. She claims that she plans to restart it one day again, but apparently, the author discontinued this series in order to start a new one, Shining. (JanimeS)

[From Viz]:

Ginta Toramizu is a 14-year-old kid who doesn't have a lot going for him: he's near-sighted, doesn't do well in school, sucks at sports, and to top it off--he's short! But Ginta is a dreamer and has had the same dream 102 times, always in the same fantasy world, where he is a hero blessed with all the abilities he lacks in real life.

Then one day a supernatural figure appears at Ginta's school and summons him to a mysterious and exciting new world! In this strange universe filled with magic and wonder, he is strong, tough, agile--and he can see without his glasses! Thus, Ginta begins a mystical quest in search of the magical items known as "ÄRMS," one of which may have the power to send him home. Joining him on this epic journey are his companion Jack and the valuable living, talking, mustachioed iron-ball weapon known as "Babbo," which everyone wants but, it seems, only Ginta can possess!

In a world where demons and humans are at war, there exists a Demon King, whose voice holds a power that destroys all in its way. When an unusual Hero attacks his castle, what's a Demon King to do other than confess his love? But thanks to meddling minions and the inconvenience of a voice that destroys everything in its path, his confession may not go according to plan...

From Del Rey:
Junior high schooler Nina is ready to fall in love. She's looking for a boy who's cute and sweet and strong enough to support her when the chips are down. But what happens when Nina's dream comes true…twice? One day, two cute boys literally fall from the sky: they're both wizards and they've come to the Human World to take the Magic Exam. Their success on this test depends on protecting Nina from evil, so now Nina has a pair of cute magical boys chasing her everywhere she goes! One of these wizards just might be the boy of her dreams…but which one?

From Tokyopop:
Yayoi, a spunky high school girl, has inherited spiritual powers from her mother, and she uses these powers to protect people. During a fight with the devil Ura, Yayoi's power turns the devil into a black kitten. Now, even though Ura doesn't hide his desire to "eat" Yayoi's power when he gets the chance, they develop an interesting relationship: the two begin living together, and Yayoi takes her new feline "friend" on her adventures.

From Aerandria Scans:

The kingdom of Gulba is racked by rebellion against its young prince. A special guard has been formed to protect the realm against the rebels. They are led by Captain Carla, the Beast Tamer. And her "beast" is tall handsome Hazel, her aide and bodyguard--and the only one she trusts. Vowing to avenge her father's death at rebel hands, Carla rescues Hazel from a circus to raise and train herself. The rebels have stepped up their attacks, there's a traitor in the guard ranks, and now Hazel is acting strangely. Can she really trust him after all...?

Akira Nikaido is a typical slacker high school student who thinks he has a normal life--until a mysterious man called Shirogane appears and tells him to meet him at the school that night. He is skeptical but goes anyway... and gets attacked by a shadow monster! Shirogane convinces him that the balance between the human world and the shadow world has been distorted, and that Akira must become a shin--a creature of the shadow world--in order to help restore the balance.

Keidai Saeki is a high school student who remembers his past life in Pompeii, living as the Italian warrior Sirix. His friends around him are all also reincarnated - although they don't quite remember things the way he does. Keidai's wife from the past? She's now a middle school boy - while his best male friend is now a cute girl?! Throw in a case of love at first sight, and you have a new look at romance - manga-style!