From DrCoke at MangaHelpers: Even after one month of transferring to a new school, Natsuki keeps her distance from her classmates. Her childhood friend Haruka always tries to push her to be more sociable, but Natsuki just pushes her away. One day, while Natsuki was skipping class and eating lunch on the school balcony, a slime-like substance drops right on top of her. The slime slowly forms itself into... a human girl? An odd relationship between Aoi and her new alien(?) sister Aoi begins.
Energy crisis, scarcity of resources, etc. Leads to its only logical conclusion: war between east and west.
A collection of nine surreal short stories sharing a theme of water. Chapter 1, Bon: A young boy ponders family affairs around Bon. Chapter 2, We’re Still on Our Way: An astronaut cadet must figure out his motivation if he is to succeed and go into space. Chapter 3, Fusion: When the ultimate form of love is fusion, the government must work to stop a declining population. Chapter 4, Such Sorrowful Stars: In a near-death experience, a man meets a solitary girl running endlessly. Chapter 5, Salt Damage Season: A young woman is captivated by marine “vortexes”. Chapter 6, Sea Weather: A girl follows a schoolmate home only to realize she lives under the sea. Chapter 7, Squish: A girl can see things she calls “squishes”, transparent blobs all around us. Chapter 8, Meltism: If we are the same as the planet, what separates us? Chapter 9, Season・Time・Water: The world adapts to the changing of the seasons.
To stop the otherworldly "Kaijuu" from invading Earth, individuals wielding special powers known as "Aegis" are tasked with the protection of the world. Aratsugu Yorino is one of the aspiring "Bastioners" - soldiers who fight the invaders within the wall between the two worlds. Yorino and her best friend Haruka were always at the top of their class, and vowed to become professional Bastioners together. However, when a Kaijuu broke through the wall during one of their exercises, Haruka lost her life saving Yorino. Cornered by the Kaijuu once again, Yorino was rescued by a Bastioner called Kaminoi Youko. After asking Yorino to give her Aegis energy, Youko defeated the Kaijuu with overwhelming power. With her heart full of determination, Yorino placed first on the Bastioner exam, all for the sake of saving herself from ever feeling loss again.
A military test accidentally sends a modern-day army back in time to feudal Japan. When their actions in the past begin to have an effect on the present, another unit is dispatched to retrieve them. But the commander of the lost unit has other plans. He intends to use his advanced technology to conquer Japan and change his country's destiny. -- {Summary by Mangaupdates.com}
From Wikipedia : Two years ago, a pair of idols, Tsubasa Kazanari and Kanade Amō, collectively known as ZweiWing, fought against an alien race known as Noise using armor known as Symphogear. To protect a girl named Hibiki Tachibana, who got severely wounded by the Noise, Kanade sacrificed herself. Two years later, as Tsubasa has fought the Noise alone, Hibiki ends up gaining the same power as Kanade.
A new discovered 10th planet, called Lametal, will collide with earth on 9th September 1999. While the impact won't affect the giant ice planet critically, earth will be destroyed. Yayoi, daughter of Lametal's queen and entrusted with the mission to abduct a large number of humans for slavery, befriends the orphaned boy Hajime and starts to question the intentions of her mother. Together with her human family and friends, she takes up the fight against Lametal and searches for a way to avoid earth's destruction.
About the relationship between a senpai and a kouhai.
On the once-peaceful planet of Industria, constant battles have been fought over control of the planet. Astro is a dim witted but kind boy who tirelessly works to feed his "family," a group of orphaned children. One day, after being fired from his most recent job, the prince of Industria, Bulge, appears in front of him. And even more shocking, Prince Bulge looks and sounds exactly like Astro! One thing leads to another, and Astro now has to take Bulge's place as the heir to the throne of Industria! Suddenly, he's faced with the task of bringing peace and harmony back to this war-torn planet! (Source Red Hawk NEO)
[In the face of justice, there are no taboos that should not be violated.] In the near future, humanity is in the depths of fear due to the onslaught of monsters. To protect world peace, the united Cross Rangers will enforce justice today! ...Or so it was supposed to be. Cross Red, also known as Akama Retsuo, is a man who is passionate about justice. With an overflowing sense of justice, he commits a taboo one night with Cross Pink. And so begins the days of muddy, terrifying, immoral and ruinous...! A suspenseful story of justice and immorality!
Kawamura Hideo, a typical ordinary guy with no job, he came to Tokyo searching for jobs, he sent a total 34 job applications to only failed at the first hurdle (all of the companies didn't even ask him to attend an interview). Feeling rejected, he became a hardcore hikikomori and shut the world around him, his parents also won't send him money since then. When he starved to death without any money, lost hope and would decide to go just die he found a computer on the street (containing Will.CO21 virus) and took it home. He found a way to participate in a martial arts tournament "Holy Devil Cup" from that computer. Where the winner could get the power to rule the world, martial artists, soldiers, vampires, Majin - all 3024 participants gather there. Now what Hideo would do to win this mad tournament...
