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Haunted by a space flight accident that claimed the life of his beloved wife, Yuri finds himself six years later as part of a team of debris cleaners on a vessel called the Toy Box charged with clearing space junk from space flight paths. The team consists of Hachimaki, a hot shot debris-man with a sailor's affinity for the orbital ocean; Fee, a chain-smoking tomboy beauty with an abrasive edge; and Pops, a veteran orbital mechanic whose avuncular presence soothes the stress of the job.
(Source: Tokyopop)

With the space program attempting to travel to Mars, 21st century scientists were tasked with warming up the planet so that humans could survive on its surface. They came up with an efficient and cost effective plan of sending cockroaches and mold to the surface so that the mold would absorb the sunlight and the insect corpses would serve as a food source for the mold.

It is now the year 2577 and the first manned ship to Mars has landed on the planet and the six crew members are ready for their mission. But what they find are giant mutated humanoid cockroaches with incredible physical strength. The crew members are easily wiped out, but not before sending a transmission back to Earth. Now, humanity will send elite warriors to exterminate the mutated bugs and claim back Mars.

(Source: MangaHelpers)

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded "By the time you hear this, I guess I will be already dead…."

(source: MU)

Having returned to college after a year long break, Hong Sul, a hard-working over-achiever, inadvertently got on the wrong side of a suspiciously perfect senior named Yoo Jung. From then on her life took a turn for the worse and Sul was almost certain it was all Yoo Jung's doing. So why is he suddenly acting so friendly a year later?
(Source: Baka-Updates)

Shuusei Kugayama is the "prince" of his high school, but he always turns down confessions—including one from Aoi Nishimori's best friend. Although she initially hates him for this, when Shuusei moves in next door to Aoi, who lives alone, she starts thinking that he might not be such a bad guy after all...
(Source: Which Scanlations)

Tachibana Souta is a bit of a multi-talented freeter who gets by from one part-time job to the next, his standout characteristic being that he's a bit short. One day he's roped by his older sister into 'serving' their college's volleyball team, of which she's a member. She also happens to be at least 6 and 1/2 ft. tall, as do the rest of the team's members who take quite the interest in Souta.

Nakano-san is a high school girl who can look into people's minds. Because of that, she finds out that the mind of the popular Toda-kun is full of wild fantasies about her!

(Source: MU)

Included chapters: 102.5, 209.5, 311.5, 416.5, 512.5, 612.5, 717.5

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; Kuzumi is a teenager with no magical skill. Mr. Hiiragi has just accidentally pulled Kuzumi through the barrier into Seinagi Private High School, a magic school.
(Source: MU)

What can you do when you get mistaken for murder? Nothing. You go to prison. Lucky you, your inmates are some of the biggest cutthroats in the prison. Seriously you are lucky. Especially when zombies attack.

(Source: MU)

The series Junjou Romantica series actually contain 3 main stories within them, which are loosely interconnected, with different couples as the main characters.
Junjou Romantica:
Misaki, struggling to pass his college entrance exams, is in need of a tutor to help pump up his failing grades. Unfortunately, his only option is the cool and sexy Akihiko Usami. Usami happens to be a famous boys’ love novelist, which doesn’t exactly float Misaki’s boat, especially since his main characters are “Akihiko” and “Takahiro,” the name of Misaki’s older brother and Usami’s childhood friend. Understandably, Misaki is pretty disgusted by the thought of someone using his older brother as his personal fantasy-material, but then after some tender loving from Usami, Misaki is also pretty confused. He may even be developing feelings for the older man...And when Takahiro introduces them to his lovely (female) fiancée, so begins the bumpy relationship of this odd couple, filled with comedy and pure romance. (Source: BLU manga)
Junjou Egoist: Kamijou Hiroki is a broken man, consumed by unrequited love for his childhood friend, Usami Akihiko (the writer character in Junjou Romantica). Along comes Kusama Nowaki, whose name "Nowaki" means "typhoon", an orphan working his way through life since middle school. Like the typhoon he is named for, he whirls into Hiroki's life and heart, blowing all resistance away before him.
Junjou Terrorist: As fate would have it, Professor Miyagi Yoh (whom Hiroki is working with as assistant professor), and Takatsuki Shinobu, a high school student, cross paths. Miyagi, when in high school, loved (and still cannot forget) a female teacher who had a terminal illness, is now faced with Shinobu, who just says whatever is on his mind. The wheel of destiny is beginning to turn once again...
Has another short story called Junjou Minimum in vol. 4, which in turn has a separate volume of its own.
(B-U)

Shimazu Toyohisa, whilst involved at the Battle of Sekigahara, manages to mortally wound Ii Naomasa, but is critically wounded in the process. As he walks from the field broken and bleeding, Toyohisa finds himself transported to a corridor of doors, where a bespectacled man at a desk waits for him. This man, Murasaki, sends Toyohisa into the nearest door where he wakes up in another world. There, Toyohisa meets other great warriors like him who have been transported as well, to be part of a group known as "Drifters".

(Source: Wikipedia)

Koudo Ikusei Senior High School is a leading prestigious school with state-of-the-art facilities where nearly 100% of students go on to university or find employment. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Koudo Ikusei is a paradise-like school, but the truth is that only the most superior of students receive favorable treatment.Ayanokouji Kiyotaka is a student of D-class, which is where the school dumps its “inferior” students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Horikita Suzune and Kushida Kikyou, two other students in his class, Kiyotaka’s situation begins to change.(Source: ANN)

Home Economics Teacher, Shinji Yabe, is asked by the biggest gal in school, Miku Okazaki, to help her "bake cookies to give to the teachers." The principal told her to do this, after she flunked every subject and makeup-class they put her in. He gets her to successfully finish a batch of cookies after several mishaps and is touched by his students glee over her success.

He decides to start a cooking club after this experience to get more time and connection with his students. Upon hearing this, Miku decides to join, since he was the first teacher that didn't shove her into makeup-lessons after her failings and pushed her to try harder instead.

(Source: MU)

Civilization is dead, but Chito and Yuuri are still alive. So they hop aboard their beloved Kettenkrad motorbike and aimlessly wander the ruins of the world they once knew. Day after hopeless day, they look for their next meal and fuel for their ride. But as long as the two are together, even an existence as bleak as theirs has a ray or two of sunshine in it, whether they're sucking down their fill of soup or hunting for machine parts to tinker with. For two girls in a world full of nothing, the experiences and feelings the two share give them something to live for…

(Source: Yen Press)

Note: Each volume contains an extra chapter which was not included in the serialization.

Kagami Junichirou was known as a physics genius when he was a teenager, and he was even published in "Nature." However, after college, he suddenly lost all interest in science. As a NEET, he's devoted himself to his anime blog and nerdy collecting habits. He claims he has a serious illness called "I can't do anything I don't want to do." Desperate to get him to do something with his life, his little sister manages to get him a job teaching physics at his old high school. He's certainly an unconventional teacher, but he becomes fairly popular with the students. After helping a girl who's being ruthlessly bullied, Kagami finds that he actually likes teaching. Will he continue his career as a weird teacher? Will he go back into physics? Or will he end up back where he started?

(Source: MangaHelpers)

Shintarou Jagasaki, who is a neighborhood police officer, lives with his girlfriend while working a job that is killing him slowly with annoyance. It looks like he will end up marrying soon and live a boring life with a nuclear family—a grim future for a guy with dreams! One such day, a mysterious monster appeared on the train and he suddenly can shoot with his right hand like Master Buppanatsu, the eggplant mascot of his city!

A young man who had surely died in an accident, was reborn in another world as a baby! After that, he was picked up by the patriot hero "Sage" Merlin Wolford and was given the name Shin. He was raised as a grandson by Merlin and soaked up Merlin's teachings earning him some shocking power however, when he became 15 his grandfather Merlin said: "I forgot to teach him common sense".

(Source: MU)

Tsuyoshi Takeo is a freshman in high school. (Both estimates) Weight: 120kg, Height: 2 meters. He spends his days peacefully with his super-popular-with-girls, yet insensitive childhood friend, Sunagawa. One morning, on the train to school, Takeo saves a girl, Yamato, from being molested by a pervert. Could this be the beginning of spring for Takeo?

(Source: MU)