From 1st Chapter:

The lead character is a naive boy who's fallen in love with an older girl who everyone considers a genius writer. He's so in love in fact, that he has forgotten for the last 2 months about his secret hobby. For the past 10 years he has been writing the "character profile" of a single girl. Her birth date, personality, hobbies, conversations, etc.... is all recorded in a large pile of notebooks. All this time this fictional girl has been his friend and lover, but now that he is in love with a real girl he decided to throw them all away.

In order to "purify" the notebooks, he decided to burn them at a nearby shrine. To his surprise, the senpai he's in love with was also there. It starts to rain and as they talk the girl confesses she's having trouble writing her novel due to inexperience. As the storm gets even stronger, the lead character believes that since she confessed her "weakness" to him it is OK for him to show her his own "secret". Filled with courage, the boy opens the bag where he brought all the notebooks... except that instead of notebooks, the bag now contains the girl (naked of course) he's been creating for the past 10 years!!

Mayama Haruki and Himemiya Tsukiko have been childhood friends and neighbors for as long as they can remember, but after a girls-only meeting in fourth grade, Himemiya distanced herself from Mayama. Now in their 2nd year of middle school, Mayama has become an ero-freak who specializes in harassing Himemiya. Determined to unravel the greatest secret of girls, what happens on "that day", Mayama follows Himemiya and uncovers.

Two Brothers are climbing a mountain to learn a secret fighting technique from an old man. Three years later they are returning to their village ...

After his happy-go-lucky lovestruck parents suddenly decide to go on an amorous traveling adventure, Yuki is shuffled off to live with one of his dad's old friends. He knows very little about his new living circumstances, save that his dad's friend is an author with three children.

Something seems a little off about the girl who's sent to meet him, the fidgety and overly anxious Aya, but he doesn't fully understand what's going on until he arrives at the house. Yuki, who has had very little to do with women thus far in his life, is now set to live in a house with four of them. The head of the house is actually an author of erotic novels, and she habitually forces her three daughters into embarrassing sexual situations. How will Yuki cope with his new life?

The main character Totoki is an ordinary high-school student who leads a mundane school life.
One day, a mysterious, primitive girl, Cherry appears before Totoki! Whatever Cherry does is a mammoth class! Because of that, Totoki is being thrown around mercilessly! Is Totoki's normal life gradually changing?!

Kei has a secret crush on Yuzuyu, the most popular girl in the classroom. One day, he is attacked by unknown warriors and the one who rescues him is Yuzuyu herself, dressed in a weird costume, claiming that she is his property and that he can do with her as he pleases from now on.

Nono Nekomiya, Makoto Yuki, Iori Yuzuki and Matsuri Amachi all used to attend the same school. As close friends they spent their days in peace together as part of the light music club. One day, the school they attended closed down. All students had to transfer, making the four friends end up at different schools. Before they left, they placed a time capsule under a tree at their old school, promising to meet again, with Matsuri running off in bitter anger. Upon returning on the promised date, 3 years later with no contact in between, they find their time capsule has been dug up and turned into a lost and found game by an old teacher of theirs. While following clues left by the teacher, the four begin to remember past memories of life at the school as well as old feelings they may still have for each other.

Furuya's obsessed with zombies. He collects any figurines, watches any movie, and plays any game with the living dead, and is even only interested in zombie girls. When his cat dies, Furuya begins trying to raise it from the dead using an ancient book of the occult he bought from a shop. But what will happen when he sees the idol of a nearby all girl's school walking close to where he conducts his experiment, wishing to die and be reborn as a different person?

Saitou, a rather arrogant kid, announces his super power to his class on the first day of high school. He imagines that it will make all the girls swoon, and he'll be crazily popular. Unfortunately, his ability to bend a spoon looks more like a cheap trick than a super power, and everyone laughs in his face.

Soon he learns that he is not the only kid with superpowers at the school, and there is even a Super Powers Research Club. He soon finds himself dragged into the society of a friendly invincible girl, a violent telekinetic girl, and a mind-reader. Rather than being swooned over, Saitou appears to have the least impressive ability of the group! Is there any way for him to get the happy high school life he was hoping for?

From Badam:

Izumi Koutarou's family have lived in Izumi Hot Spring for generations. But the spring suddenly dried up a couple of years ago, resulting in a huge family debt. As they prepare to skip town to flee from debt collectors, the guardian deity of the house, Konoha-sama, appears. Konoha-sama, (who was supposed to be a really fearsome god), appears instead as a cute girl--wearing no clothes. What will happen to their family debt problem? And what is the power of Konoha-sama?

In order to pay for the debt that his parents left behind, Gin accepts an escort job from the bill collectors of the Tokugawa Group conglomerate. The client is a girl named Hikari who goes to Tokugawa Private Academy. Using the experience he gained from his previous part-time jobs, Gin protects Hikari along with the other escorts, Suke and Kaku. However, Hikari seems to have a hidden secret...!?

Minazu Aruto loves reading novels and short stories so a classmate recommends a club that the school has called Philosophia. The classmate doesn't really know what the club is about but the name sparks a curiosity in Aruto and he decides to find out what it is.

He goes to the old library on campus where he meets and is introduced to all three members of the group: Tomoe, Takaho and Kaede. Still without knowing what the Philosophia club is about, Aruto finds himself joining what he thinks is a literature club.

Kaguya is a boy in an all-girls' school for demons [fox spirits, succubi, werewolves, etc]. Being the only human is bad enough, but the added risk of his manhood being discovered makes for silly and unbelievable (deliciously enviable) situations.

Werewolves, demons, monsters, vampires. All these ferocious creatures are afraid of the same thing: the beautiful Princess Hime, an awesome warrior who fights off the forces of evil with a chainsaw and a smile. Not only does she look great in a tiara, she has power that allows her to raise the dead. She's a girl on a mission, and with the help of her undead servant and a supercute robot, there's no creature of darkness she can't take down!

The story sets one month after Eita and Masuzu start dating, and sets itself on a "what if" scenario where the Harem element is stronger than in the original.

Having lost the Sword of Light in the previous battle, Lina and Gourry continue their journey in search of a replacement weapon. On the way, the two of them meet up with Amelia and Zelgadis in the kingdom of Luvinagard while taunting some pirates. Lina is happy to reunite with her old friends, but appearing before her is Luvinagard's Inspector of the Special Investigative Unit; a man called Wizer. However, Lina is amazed at his unusual behavior...

From MangaHelpers:
Before they enter high school, the boys Meguru and Shou are whining about the fact that neither of them has a girlfriend. A strange, large-breasted woman shows up, claiming that she will fix their problem, and kisses Meguru. This odd occurrence is pushed out of the boys' minds when they meet up with Souko, a friend from elementary school, who is going to be in their high school. She's grown up into a pretty young girl, and it seems like the boys might have a shot with her!
That evening, Meguru realizes that the strange kiss may have had more meaning than he thought: he's turned into a girl! He convinces Shou and his mother of his identity, but no one has any idea how to turn him back. Now he's going to have to learn how to be a girl and let go of his hope of dating his cute childhood friend Souko. What will happen to his hopes for a popular high-school life?

From SCX-Scans:
Though it was a bit strange, three people ended up meeting. One, who looks younger than her age and able to see the supernatural. Another who is possessed by a "Yamanko" which refers to "Yama no ko", or a mountain child. She was possessed due to her bloodline and due to the possession, she has superhuman abilities which she can call upon. Finally, an awkward person who enjoys writing poems. Coincidentally, the three are also classmates.

The manga is separated into 3 story arcs with close to none relation with each other's characters.
Volume 01-13: Video Girl Ai
Volume 14-15a: Video Girl Len
Volume 15b: Video Girl - Complete Story (about Video Girl Haruno)

Video Girl Ai [From Viz]:

High-school student Yota Moteuchi is so unpopular that his classmates have given him the nickname "Dateless." So it's no surprise when the love of his life, Moemi, is not interested in Yota but instead is in love with Yota's best friend, Takashi. Yota turns to a video rental shop for comfort, but little did he suspect that the shop was magical and that the cute girl on his rented tape would pop out of the television and try to fix his ruined love life!

Randou Masashi, a self-centered, brash karate star, was the victim of a horrific bus accident that left him comatose, his face terribly disfigured by extensive burns.

Genius plastic surgeon Dr. Manabe saved Randou's life and went to work on his face, gradually reconstructing it based on a photograph found in the wreckage of the bus. But in a cruel twist of fate, the photo that the doctor used as his reference was not a picture of Randou, but of Rina Kurimi, the girl whom Randou has a crush on!