From Dark Horse: When supernatural police officers come to take De-Mo back to the demon world for execution, Aimi, aka Shadow Lady, agrees to take on a special mission in order to save her demonic pal. Aimi must help recover the Demon Stones that were stolen and released into the human world. But each stone contains an imprisoned arch-demon, making Aimi’s mission as deadly as it is difficult. And if the secrets of the Demon World become known to the human world, De-Mo’s life will be forfeit

Eiji Matsuda finally managed to go out with Emi and promised to agree on the condition that they can't have sex. After 6 months he decides to break this promise.

Tsuyomaru is a girlish boy while Hazumi is a tomboyish girl. Tsuyomaru is challenged to a fight by a student of another karate school, and while using a training machine operated by Hazumi, something goes wrong and they switch bodies...

Jin, a mysterious kid with a halo carved in his hand, and extraordinary fighting skills, lives with his grandfather in a beggar's community. In other place, the old scientist Amagi is searching for professor Kanzaki, to ask him for the whereabouts of the "player" -a kind of genetic altered humans- Zet, which they created some years ago. Soon, Jin and his grandfather are attacked by a mysterious man who turns into a monster.
The connection between professor Amagi and professor Kanzaki, seems to connect also young Jin to the mystery of the "players" and Zet.

A touching story of a doctor who wanted to help people even though he became a vampire.

Shy Ichitaka has a crush on his high school classmate Iori, but ever since she posed for semi-provocative swimsuit photos in a magazine, she's had a lot of sleazy guys hitting on her. Ichitaka's afraid to make his feelings known for fear Iori will think he's just another creep.

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!

Japan in the future has a massive over-population problem. Scientists have traced the root of this problem to one particular individual, Junta Monamari. According to their records, Junta was a "Mega-Playboy" who had sired children with over a hundred women. Each one of his sons had inherited the Mega-Playboy gene too, so the problem grew exponentially from thereon. Enter Karin Aoi, a "DNA Operator". Karin is sent back to the past with a mission: to alter Junta's DNA and prevent him from ever becoming the Mega-Playboy, thereby eliminating the world's overpopulation problem. Junta's DNA can only be altered by shooting him with a special bullet called DCM which contains the chemical for suppressing the Mega-Playboy DNA. In return, Karin gets a vast sum of money... enough to make all her dreams come true. Will Junta become the playboy he is destined to be, or will his better self prevail? But Karin is falling for the real Junta too... and what of the sweet and kindly Ami who has secretly loved Junta all her life? What will happen to future Japan?