Satou Hiroshi is the kind of polite, innocent, cute boy who's popular with guys and girls alike. But word-of-mouth has it that anyone who dates him will be plagued by a series of unfortunate events and near-death experiences - eventually being forced to institute a break-up 'under pain of death'...

Will bespectacled, 'uncool', baseball-crazy Tsumabuki Kasumi prove these rumours wrong or experience them first-hand? But after falling for Hiroshi's cute smile upon their (rather weird) first meeting, he's determined to tempt fate and find out whether he can finally break out of this unlucky streak and strike it lucky in his love life!

Han Se In finds street fighter Moon Ji Soo on the street. When she tries to help him, he tells her to go away. Se In wants an apology but Ji Soo won't give one. She then slaps him and runs. Moon Ji Soo wants revenge...

Keitaro has had great difficulty getting into the university of his choice and no luck in meeting women. In a desperate effort to go into seclusion and study for his entrance exams, he volunteers to take over running his grandmother's hotel. His plans are ruined when he discovers that the "hotel" is actually an all-girls dormitory and some serious distractions ensue.

Note: Won the 25th Kodansha Manga Award for Best Shounen in 2001.

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!!

"Koganeiro" is about a group of high schoolers in their second year who are confronted with the possibly life-altering decision of what to do after high school.

Fall from a building, fall in love.
Shinji was a high-school guy without a future.
He went up to the roof of a building with plans to jump, only to run into his beautiful teacher, Shinanoya-sensei!
Then she made a shocking proposal that would change Shinji's destiny...
An exuberant tale of double suicide from the pen of a genius!!

Mitama Kamishiro is an athletic junior high school girl with a strong sense of justice who has dreamed of becoming a crime avenger since she was little.
A mysterious shopping district, “Yaoyorozu Shopping District,” suddenly appears in front of the silly yet righteous Mitama, who “wants to save humanity from its inevitable downfall.” When Mitama goes to the shopping district that seems to be calling out to her, she is faced with. This is a Shinto-inspired comedy about a silly, righteous high school girl and some bizarre Gods. Hurry up and pray!

From Bliss:

One day, Kunisada Haruichi who is specializing in Japanese dance in his high-school dance department, meets Yuri Arbatov, a famous and young ballet dancer who comes for a short-term study abroad. However when he gets a hold of Haruichi's weakness, Haruichi is forced to crossdress on stage...

Though its title logo resembles a certain light novel, and his younger sister is particularly cute, the student council president doesn’t have any mystery to solve about it.
It is just as it says, a comic about a grandpa telling his grandson a strange story.
What is strange about it and why is something you’ll have to read the comic to find out!
You’ll find yourself chuckling while you read, as you enjoy the charming world of this grandpa.

Comical sidestories from within the main series' timeline and featuring some new characters.

Collected in Volume 28 of the main series.

This oneshot is about a couple that likes to play dress up to spice up their love life.

From Bliss:

While buying food at the supermarket, Sunao Morihara gets kidnapped by a strange man, Kuon Tachibana, who turns out to be incredibly rich! His motive? He wants Sunao to be his friend. However, before Sunao realizes, being Kuon's "friend" actually means becoming his wife!

Ichigo is out on a date with her crush when suddenly she's involved in an odd incident in which her DNA is merged with the DNA of an almost extinct wildcat. When four other girls' DNA is merged with the DNA of four other almost extinct animals, it's apparent that they're part of a much bigger plan. Ichigo and her friends have been chosen to become a part of a secret project called the "Mew Project." Their mission: To protect the planet from aliens who are using the planet's animals to attack humans.

From Viz:
Mimori Kosaka's dream comes true when she's accepted to the Meidai Attached High School and gets to wear their super-fashionable uniform! She's excited about having a fun freshman year of high school, but things don't turn out as effortlessly as she had hoped.

Includes the following side stories:
Volume 1: Basically Pure-Hearted
Volume 2: Kiss the Mike!

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 ...

From MoonFlower Scans:

Mustuki Yoneya, a high schooler, feels insecure and jealous because her constant companion and best friend, Nishio Kyuteki is starting to pay attention to a beautiful upperclassman. Seeing the senpai's attractiveness as a threat to her wish to remain at her best friend's side forever, she tries out several attempts as she strives to become the main object of Kyuteki's attention.

Note: Original language image is not available.

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 hilarious misadventures of the "Sket Dan"; a couple of high schoolers who help out people as part of their club activity: Himeko, the hot-headed ex-delinquent with a soft spot for cute things and a taste for strange food; Switch, the brainy otaku who only talks via a computerized speech-application; and Bossun, the atypical leader of this looney bunch, with the amazing power to... concentrate very hard!

Sket Dance won the 55th annual Shogakukan Manga Award in 2009 for best shounen manga.

From Aerandria Scans:

Takamura Uru takes her mother’s remarriage as an opportunity to strike out on her own and begin a part time job. Filled with the thought of “If only I could make someone happy…”, she begins working at Café Bohneur, a shop famous for cakes; but the employees, Ichirou-kun and Shindou-san, turn out to be incredibly unsociable. These two, though frightening at first glance, begin to change something inside of her. This is the start of a romance about Uru’s search for happiness.

Contains the Oneshot "Suitei Seinen Shoujo"

From Shinnen:

The Hachiouji family hunts demons in the darkness. The heiress of the Hachiouji family, Takamichi, lost her older brother at a very young age. She isolates herself, but, one evening, two werewolf pups are given to her. After just a few years, they have grown quickly, and they even go to the same senior high school that she does!