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!

Bakuten Shoot Beyblade = Beigoma (a Japanese spinning top game)

Takao Kinomiya dreams of becoming the best beyblader in the world. Along with his friends Kai, Max, Rei, and Kyoujou, they make the team known as the Bladebreakers. They strive to be the best but don't do it alone... because within each of their beyblades resides a Sacred Spirit that gives them even more power to reach their goals.

Now, an entirely new kind of lifestyle has been created.

A lightly paced manga about two girls who live together. A classic odd couple setup featuring a responsible character with a caring atmosphere and a more free spirited musician who has trouble both feeding herself and paying the rent.

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?!

Teenager Hideki Yuu finally musters up the courage to confess to his crush, Miki, only to have her reject him. Three days later, she becomes an idol...

Fujisawa Toru’s debut manga.

Every day is boring, too boring...
Until a witch casts her spell on it?
Masa, a second-year student at a third-rate art school, draws because he doesn't know what else to do with his life.
Then he meets Aoi, an attractive first-year girl, who seems, somehow, like she might be a witch.
Will Aoi and her secrets light the fire in the gloomy Masa's heart?
Though it doesn't seem much like living, life goes on, as young men yearn only for yearning.
Though every day seems so inconsequential, the special spark of that time of life defines what it means to be young.

Two boys, Mitsuhashi Takashi and Itou Shinji, meet each other at a salon. It turns out both boys are transferring to a new school and decide to take the opportunity to reinvent themselves. No longer will they be run of the mill high school students, they will become the biggest delinquents Japan has ever seen!