Everyone lies when they are young, but the lie Kobayashi Hiro told when he was just six haunts him daily to this day. He claimed that he was abducted by aliens, and, even though it was quickly discovered it was a hoax, thanks to national attention, the town became a hotspot and tourist stop for UFO fanatics.

So when the beautiful Yamada Meteor transfers to Hiro’s school, claiming that she is an alien and Hiro is the only one that can save the planet from destruction, he thinks that the whole thing’s a prank. He quickly learns that she isn’t joking.

Meteor is here to test if humanity is worth saving from the monstrous asteroids headed toward Earth. To prove humanity’s worth to the universe, Hiro must complete the assigned missions, even if they are a little perverted.

Thirty years ago a series of meteorites rained down on Earth, destroying much of civilization. Decades later, pockets of humanity are beginning to reemerge, but many of the children who have been born after the crisis have been mutated by radiation from the meteorites. They are called the Meteorite Breed.

Tooi, a fourteen years old kid that eats a lot, is one of the Meteorite Breed. But he is a rare one...

Satomi High's Football Club members are bunch of weirdos, there's a former yankee (delinquent), a former Hikikamori, one short-tempered guy and on top of that their captain is a 'chibi' (shorty), who looks more like primary schooler than a 2nd year high schooler, but don't be fooled - despite the fact of being all-freshman brand new team in a brand new high school, those guys made it to the best 4 of Chiba Prefecture last year! Their newest recruit is an almost 2m high guy, who is surprisingly bad at headings (despite having a height advantage). Fortunately the chibi-captain notices his potential as an attacking midfielder... How far can this team possibly go in this year's tournament? (From:MyAnimelist.net)

Masakichi-kun is a first year high schooler working as an errand boy for the upperclassmen bullies. One day he slams into a female member of a biker gang, touching her breasts... She saves him from a falling steel frame from a construction yard and leaves without saying anything... Later on, she suddenly shows up at his school causing a ruckus. What will happen to Masakichi-kun?

The story revolves around Takumi Tsuzuki, a boy who lives with his older "sister" Otome, although the two have no blood ties between them. Otome manages a run-down confectionery store called Stray Cats. One day, Otome picks up a mysterious beautiful girl off the streets.

Mikio teases his neighbor Mariko a flat-chest and she calls him a midget. When one day Mikio turned miniature and ended up in Mariko's care, they discover how wrong they are about each other.

A collection of one-shots:

Vol 1:
Magician
Fairy Tale
Cocona
Plue's Adventures Pt. II

Vol 2:
Bad Boys Song
Magic Party
Christmas Hearts
Fighting Group Mixture

From Neptise Scans:

The story follows Shintaro, the Ganma Army's #1, after he gets stranded on the wacky Papuwa Island.

Nanami transfers to St. Marivel (Mary Bell) High School from America as she looks for her childhood friend, Kotaro. In a school where the ratio of male students to female students is 1:20 respectively, Nanami gets involved in a conflict with a male student who is almost twice her size. As Nanami was about to engage in battle, she catches a glimpse of Kotaro and stops, allowing the male student to grab hold of her! How will she get out of this situation?

From Anime New Network: Zushio was to be king and promised his sister that he would become king (on penalty of death). Unfortunately for him, his empire was overthrown and now he's a wanted man. A girl has the misfortune of running into Prince Zushio and becomes tangled in his plight. Adding to her misfortune, Zushio is not quite right in the head, but hey, at least he seems to be immortal.

During a flashback, an interviewer inquires Kuzumi Taiga, a prospective student for Seinagi Private High School, on what he would do if he could use magic, during his entrance interview. He replies, "take over the world", with an outburst of laughter, from an attractive girl, following his answer.
After the entrance exam, the school rejects his application; although he recalls almost nothing after this event, he does recall the girl, and believes the cause of his school of choice rejecting his application involves her.
Wandering around outside of the school the next day, Kuzumi tries to enter, but an invisible barrier blocks him. A teacher, Mr. Hiiragi, confuses Kuzumi for a student of the school ditching class and pulls Kuzumi into the school through the barrier.
Seinagi Private High School is actually a magic school and Mr. Hiiragi has just accidentally pulled Kuzumi, a teenager with no magical skill, through the barrier into this school.

Crimes committed by "Kaijin," superhumans produced by technology, are on the rise in Tokyo. Shibasaki Ken and Momoyama Reiji are assigned to work together to solve a recent serial killer case. In some ways they complement each other nicely: Shibasaki is an expert tracker, and Reiji is an expert at combat. Their personalities, however, do not mesh at all. Shibasaki would rather skip work to flirt with girls, while Reiji is violently overzealous about his job. Will they be able to work together to solve the crime before more lives are claimed?

Human Experiments have taken place and a group of people have fled the facility experimenting and has formed a family. The boss, a young lady, has a power, a power she hopes to cure everyone with.

The tale of Monster Soul takes place in Elfenland, which is inhabited by both humans and monsters. The main characters are a group of monsters called the Black Airs. The Black Airs is recorded as the strongest group of the monster forces in the great war between the humans and monsters.

The story takes place in a fictional world full of monsters and adventurers called Monster Hunters, who, as their name implies, hunts these monsters. The plot revolves around a young Monster Hunter, Shiki, whom was taken in as an apprentice to a Monster Hunter named Gurelli as a child. A few years after Gurelli's death, which was due to a gunpowder incident, he comes back to his master's residence, Akamaaya Town, to join the guild there. In that guild, he meets a girl called Irie and after a series of events, he finds that she is the daughter of his master. From this point onwards, they form a party to find the legendary Miogaruna, which was Gurelli's life-long ambition.

From: Easy Going Scans

Mahiro is the prince of the Mismarca Kingdom, he won't study nor learn sword skills, he is a lazy prince who only plays until late night. His Imperial Bodyguard Pariel would always scold him for his behaviour. And towards that Mismarca Kingdom an elite squad from the Demonic Kingdom Granmarsenal is aproaching. The Leader of the squad is Lunas, a warrior princess, the third Princess of Granmarsenal. All of Mismarca's vassals voiced their will to fight and bring all-out war, although there is a man who said cowardly "Why don't we have a talk with them?". What kind of fate awaits the Mismarca Kingdom and its useless Prince, Mahiro?

Enter our hero Wakadaishou! He doesn't have much interest in school; he saves his energy for all the excitement he can stir up after school. This is an early Adachi Mitsuru 'youth manga', filled with engaging characters, comic scenes, and a young hero with a zest for life.

Also included are the following stories:

• Isourou wa tsurai yo (Being a Freeloader Is Tough!, sequel to Isourou yori hitokoto included in Yuuhi yo nobore!! V.1) (V. 1)

• Kimagure Punch (Whimsical Punch) (V. 2)

Is all still fair in love when friendship is at stake?
Three friends, one childhood promise, and a boxing match that might just be instrumental in untangling a tricky love triangle.

May the best man win!

Nishikaze to Taiyou (lit. The West Wind and the Sun) is a one-shot from Mashima Hiro, mangaka of Rave Master and Fairy Tail. The story follows treasure hunters Zephyr (西風) and Sol (太陽) as they search for a statue of a goddess atop a mountain. They find the statue, but suddenly, the statue comes to life...!

Track and field star Nimi, sees a boy molesting a girl on a train and he falls in love with her at first sight, as he get off the train he watches a baseball game where the girl is crying, her father is the coach of the team and the team is losing badly, he then swear to join the baseball team to make her happy, but there are obstacles one of her childhood friends is a extremely talented baseball player and loves her, and is always proposing to her and trying to make her his, and then there is another girl the ace of the track and field team who has fallen in love with Nimi when he was still doing track and field, and is trying to make him hers.

From Adachi's Universe:
We start with our main protagonist, Shichimi, bidding farewell as he readies for his journey into Edo (on our Earth, Edo was the old name of Tokyo before it became the capital of Japan). His mother has just died, only leaving him a walnut and a request for him to go to his half-siblings. Shichimi bids farewell to a sternly old man, who is a firefighter. We can tell this from the symbol on his cloak. This symbol is also on Shichimi's cloak. Upon reaching the town of Edo, Shichimi meets a mysterious man, who ridicules the peace of the world as an illusion.