From Wikipedia: Enno Ozuno, Master of the Enno temple used the demon guardian spirit Zenki to defeat the demon goddess Karuma. After defeating Karuma, he later sealed Zenki away in a pillar until needed again. Centuries later, his descendant, a school girl named Chiaki Enno (役 小明, Enno Chiaki, or Cherry Night in some dubs) is able to free Zenki, although the demon currently has the form of a brattish demon child. To transform this extremely defiant demon into the form that made him useful by her ancestor, she uses a bracelet that appeared on her wrist when servants of Karuma broke the seal that imprisoned a seed of Karuma. Zenki appears because the seeds of Karuma (which look like eyeballs) start appearing and turning people into monsters and Zenki needed again to eradicate this menace.

“Aurora City” is a place that never knows sunlight. Due to limited resources and for the sake of racial purity, every 10 years, all young people in the city should fight in a big tournament. This year, Cill Codon, who has an unusual black hair and eyes is eligible for the dead-or-alive survival battle...

The human can’t choose their ideal body. A memory that had been carved in the flesh would not vanish no matter how much we tried to alter it. A newcomer thus arrived in the town, bringing a gun that could swap people’s bodies. The fierce but full of smile adventurer walk with a secret quest—to find the original body that was taken by his wife.

Soura's out fishing with his sister, mother, father and other fishermen when they come across a storm which wrecks a ship. Sola's parents head out to rescue the survivors, though Sola questions why since the destroyed ship is a Velinard merchant ship. His father says that it has nothing to do with the fisherman, that they're fellow sailors just like them, not to just abandon them. Sola's mother, Mana tells Sola that he should always look after his friends, and as a man to be able to protect the woman he's in love with. A black dragon suddenly appears, is shown to be the one causing the storm. A white dragon also appears, and seems to be fighting with the black dragon. Sola falls into the ocean, is wondering if that white dragon is watching over him.

Post-Apocalypse society, a genetically engineered 'jinzou ningen' and an immortal off on a quest to the west.

Tarou was just an ordinary university student until a strange old magician summoned him to another world. Upon learning that his newly acquired magical power is 8 million (8 million more powerful than an average magician), he uses his abnormally powerful magic to revive the old man that caused all this... in the form of a frog. Thus begin the strange adventures of a boy with ridiculous magical power and Kawazu, the former strongest magician, now revived as a frog.

The devil who lost its magical power in the fight against long angels fulfills the principle of absorbing the human soul and restoring its power! It was a demon king who traveled to the human world with a trusting four heavenly kings, but the destination that I reached was a solitary island of the ocean...! On that island where magic can not be used, a survival that can laugh backwards with the sadness of rulers and subordinates in the Makai begins!

A depiction of the story of Joan of Arc.

Content with her ordinary life, Lyra is somewhat of a wallflower. However, her comfortable lifestyle suddenly goes astray when she accidentally plunges into the world of sirens. Entangled in a curse, Lyra will learn that her world may be a lot bigger than she had ever imagined.

From MangaHelpers:
Summoned into an alternate world of Alayzard, Ousawa Akatsuki helps defeat the demon lord, brings harmony back into the world and, under the demon lord’s last request, takes the demon’s only daughter back into Akatsuki’s own world.
It turns out that being teleported into a different world is somewhat of a common occurrence back home. Those who return often come back with the power to use magic. So a worldwide organization, fearing people like Akatsuki, created Babel, a school to teach and keep tabs on the magic users.
Akatsuki is able to bring the demon lord’s only daughter into Babel as his sister, Ousawa Miu. A new chapter for Akatsuki is about to begin--this time, in his own universe!

Regularly mistaken for a boy and/or vampire, the traveler Kuro roams the land, clothed in black from head to toe, a Kuro-sized coffin on her back. Accompanied by her snarky bat friend, Sen, the mysterious duo meets all sorts of individuals en route — some good, some evil, some just plain crazy!

But Kuro never stays in one place for long, begging the question: What exactly is she searching for? And what exactly does she intend to do with that coffin?

After a terrible earthquake, Satoru wakes up in a pitch black cave that him and his friends were exploring. Desperately moving through the crumbling cave with just his backpack, he expects a warm rescue once he gets out. But what awaits Satoru was an unbelievable fact: Japan has sunk underwater due to the earthquake and he is stranded on an island with no one to help him. Can Satoru learn how to survive by himself?

Ever since He Mulan, a 28-year old forensic investigator, transmigrated into the post-army civilian Hua Mulan’s body, she’s been under a lot of pressure. Unlike the folktale ending, there are no flowers or applause to be found here. After leaving the army and returning to her hometown, word by the countryside has painted the now 32-year old Hua Mulan as a homicidal maniac, an old hag, and a freak of nature, among other nasty things. Between piecing together Hua Mulan’s scattered memories, grappling with her fellow villagers’ prejudice against her, and fending off Mrs Hua’s attempts to match make her, He Mulan has her hands full. All He Mulan wants to do is protect Hua Mulan’s body till her soul comes back, but fate has other plans…

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The world lost a heart. The time is messed up. To find the center again! Where's Alice?

Once upon a time, there was a powerful demon world who threatened the world, bringing death and destruction in his wake. Humanity banded together and, after much hardship, were able to defeat him.

Millennia have passed since. While the demon lord is dead, his influence still rings throughout the world. Dungeons pop across the world frequently, filled with both treasure and danger. And a new trend has been created as a result.

They’re a bunch of teenagers, all looking for popularity. Utilizing fairy-mounted cameras, they livestream their adventures in these dungeons for the world to see. They live for both the risk and the views. They are Dungeon Tubers.

Aqi (ah-chee), a boy with god-like strength, finally gets fed up with his fellow villagers who are constantly relying on him to help them. So he leaves on an adventure to save the world! (but from what, we have yet to find out...)
After quickly getting lost in the nearby forest, he finds a girl named Misu about to be eaten by the dangerous wildlife of the forest! Using his inhuman strength he saves her, and after finding out she can cook, he decides to bring her along on his adventures!

In ancient times, the Heavenly Emperor opened the Gate of Firmament, connecting the Heavens and Earth. Even mortals could learn to ascend to the Gate to meet with the Emperor and to obtain divine powers in order to aid the mortal realm. Unscrupulous individuals took advantage of the Emperor's gesture, and plunged the human realm into chaos, filling the lives of the common folk with anxiety and weariness. At this time, the sibling gods Fuxi and Nüwa took pity on the people and convinced the Queen of Huaxu to close the Gate forcibly with the help of Emperor Zhuanxu. From then on, no one could reach the Heavens with impunity, and no god could travel to the mortal realm freely. This incident came to be known as the Isolation of the Heavens and Earth. -Based on the game 軒轅劍外傳穹之扉(The Gate of Firmament)

Goblin Slayer has enjoyed many an adventure, but the people around him have adventures of their own!

A new spin-off from the wildly popular Goblin Slayer series following the lives of the many other characters Goblin Slayer and the main cast have encountered throughout their adventures.

A parallel world fantasy of the kin of dragons - the curtain opens!! What exists at the ends of the earth - one day, a child of the water dragons meets...?!