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...?!

Follow the adventures of Zack, a crazy boy with even crazier strength who loves to fight! What starts out as an innocent boxing match soon leads Zack into the world of invincible demon-possessed teenagers, acid-spewing mutants, and craven, bloodthirsty cultists! If you're looking for a manga that just bleeds insanity, then you've found it!

The day a young boy was born was the day that the legendary thief died. The many battles that revolve around the treasure left behind by him. Here, the curtains are pulled and the story starts.

Kuchina grew up with a scar he got when he and his sister was brutally attacked by the “savages”. 10 years after the incident, he finally joined “WSD” (World Savior's Duty) as a “Stinger”. Together with his new bizarre teammates, they will bring justice to the chaotic world---!

According to old legends, the Stanle stone is said to contain the unlimited power of the universe... And the day when its power will be liberated fast approaches...Lila, an amnesic girl who holds the key to the secrets of Stanle, meets Lin, a boxing expert, and Aya, a girl who loves playing with guns. The three girls join forces to resist their pursuers and approach the heart of the legend...Simpler fan's synopsis - Charlie's Angel trio kind of but without Charlie, and always in thongs and sexy outfit on a fantasy in a after-apocalyptic-world-like Hokuto no Ken instead of Mad Max, banded together one a journey to obtain the Stanle (nothing to do with Stan Lee) stone that it is said to hold unimaginable and fathomable power.

Insia wields the holy sword Kalsis to harvest the highest of delicacies, dragon meat, and become the greatest dragon meat chef.

He’s been transported to another world. And the adopted son of a powerful family. But the heavens are unjust he has bad cultivation. But heaven pitying him has given a magical space.Follow his journey in this new world…

Junpei Takeda, a high school student, is childhood friends with Noriko Tatsumiya and the bully Kido Shouta. One day, during the usual course of bullying Junpei, they were suddenly summoned to a different world by the whim of "God". Summoned Heroes with cheats, or so he thought. But it turns out Junpei's stats were even worse than an average farmer. Tricked into a deathly labyrinth by the only one he trust, he walks the journey for revenge.

A group of elite warriors, with otherworldly powers, are fighting to rid the world of Maligans and monsters killing the inhabitants of their World. They encounter a bunch of humans, trapped in their world, whom they need to protect and send back them back home. Along the way, they come face to face with the dark pasts and unravel the mysteries of the place they're living.