Science fiction manga series about the discovery of a gateway in time and space deep underwater which allows for travel between the present day and the age of the dinosaurs.

Yamada Masami leads a double life. During the day, she's an ordinary student in Tokyo with glasses and pigtail braids. At night, she dresses herself up and becomes the glamorous call girl Miyabi. She doesn't just do it for the money; she loves the pleasure and happiness she can bring to her customers.
It seems like this double life can't last forever, though. Her chubby friend Aki, who spends her time desperately dieting in order to attract a man, doesn't understand why Masami is so opposed to getting a boyfriend. Her other classmates, the perverted Kaneko and the rich Sasaki Kaori, have opposing views of the acceptability of the pleasure industries. What will happen if the people who know Masami during the day discover the secret existence of the lovely Miyabi?

Urashima Eiji, a college student, goes to sleep after a fun drinking night with his friends. When he wakes up he discovers a beautiful girl next to him who treats him as if they are in a loving relationship. Later, Eiji finds out that 3 days have passed since he went out with his crew. What did he do during all that time and why does he have no memory of it? By confronting that reality, he will be caught in tragedy...

A crazy manga about Minako, a young and beautiful woman living alone with her cat, Moeko. And ahegao. There's also ahegao.

Even though he’s such a good-for-nothing…
Why is my heart racing like this!?

Hazuki Umi is a caring middle school student, beloved by everyone who lives on the island.
In contrast, Inoue Fuuta has done nothing but be lazy at home ever since he moved to the island to open up a guesthouse.
An overwhelming age difference of 15 years lies between them.
He has no delicacy, he isn’t reliable at all…
And yet, his words always manage to make her heart race, her face flush---

The age-gap romance between a pure middle school girl and a boring 30-year old man begins now!

Three days dragon flight from the nearest town, deep, deep in the forest, then deeper still, lives a 'witch'. Nina the witch, also called "The world's strongest witch". Visiting her is the apprentice, Iris.
This is the record of the witch and her apprentice's peaceful days, in a remote forest that breathes illusions and magic.

There are many students at Iojaku Private Girls School who have eccentric personalities. From the girl who is overly attentive to matters regarding public morals to the point she would kneel and stare straight into the crotch of a man who is pants down on the toilet, to the delusional girl who loves her teacher way too much and often has lewd daydreams about him in school, as well as the girl who's a self-proclaimed sadist. Then there's the teacher who watches over them, an iron wall that remains unperturbed by the perverted happenings around him. (Source: Mangaupdates)

Links:
Bookwalker Separate Chapters: https://bookwalker.jp/series/239081/list/
eBookJapan Separate Chapters: https://ebookjapan.yahoo.co.jp/books/580063/

"When you lose something, there is something that you remember." Hinata Wahei, a 28 year old office worker, with the sole ambition to start his new single lifestyle, was suddenly forced to live together with three sisters. The unforeseen co-existence is filled to the brim with trouble...?

A story about a small family of 4. It's a tale from "I'm home" to "I'm off."

A group of young girls possess a mysterious power known as “Alice’s Dream,” which gives them the ability to turn their thoughts into reality. Detained and experimented upon, these youths are locked away in secret until one of them manages to escape. Her name is Sana—a girl with the power to ignore the very laws of physics. When this willful powerhouse crosses paths with a stubborn old man named Zoroku, his carefully-ordered life will never be the same again!

Once before, Seven mythical Gods appeared on Earth and their battle split the earth and tore the sky. 10 years after the battle, the calamity should have passed already. However. A boy named Shinsen Raika had his true little sister abducted by a god in the battle and was currently standing in the『Academy』on an artificial island in the distant seas.Here, the night was called as after school time.
During that time period, the 『Gods’ Proxy War』 were being held by using Divinity-Compatible people for gaining the seat of the law of world.
On the first night, Raika was attacked by the Norse mythological God Brynhildr. With death in front of him, he acquired the detestable power of the gods; the power for revenge. Absolute Domination. Using the power from the devil eye of Balor, he tries to take back the world from Gods control.

Six months ago, Karukozaka High School was sucked into the demon world, and in the ensuing chaos, only two survivors emerged: Nobu, who defeated the Demon Lord that took over the school, and Yumi, who possesses latent demon powers of her own.
Although they're both trying to put the incident behind them, the gateway to the Underworld remains open, and soon Nobu finds himself battling demons right on the streets of Tokyo. The reason for this infestation is simple: a secret organization is trying to establish a Demon Kingdom on Earth by summoning demons through the gateway.
Nobu and Yumi are the only people to have been to the Underworld and survived, so they may have the power to stop the infestation but before that can even happen, they'll have to find each other first.

When the Chemistry teacher secretly practices witchcraft at normal school, many things can go wrong! Fuyumi Renji realizes this as Kirise Ririka somehow walks through all his magic barriers and interrupts his spell casting! How could a normal high school girl ever be able to do this?

Nishimori Tooru (31), an unattractive office worker, is married to the most beautiful woman in the company, Mika-san. From an outsider's point of view, they would be envious of him. However, he has a secret he cannot tell anyone about. The only female he knows is Mika, but Mika had known lots of other men. Because he loves her, he is bothered by this fact. "It's not possible, and it will never come true..." After falling off the train tracks, a miracle occurred. This is a twisted but a youthful and pure love story about he who longs for his wife's virginity.

From MangaHelpers:
This is a story of how an esper meets a girl in a small northern town. Tsubasa lives in a dying hot springs town, and he's a mostly friendless middle school delinquent. He actually has super powers, though he thinks of them more like embarrassing and useless powers. Sure, he can use his telekinetic abilities to brush his teeth while getting dressed, or read a book while drinking tea, but for the most part, it's easier just to do stuff with his hands.
One day, though, he hears the thoughts of a mute girl, Yuki, who is targeted for rape by other delinquents, due to her silence. He comes to her aid, and finds that to his surprise, he's able to manipulate her body to beat up her attackers! Unsurprisingly, she draws the conclusion that she is the one with super powers. Since Tsubasa's the only one who "knows her secret," their story together is just beginning!

4-koma spin-off of the Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka series.

Adventurers dive into the dangerous dungeon with the help of the <Grace> granted by transcendental existences called Gods. This is the story that covers the hilarious daily life of such Gods and Goddesses and their <Familia>, who are forced to run around on their whims.

When escaping from the angry girlfriend of a boy she just finished blowing, Sanako enters a random classroom and meets Yuito, a serious and handsome boy who she immediately falls in love with and proceeds to get aroused by. Taking to heart the school rule that forbids students from forming romantic relationships, the overly serious Yuito refuses her confession. So what is she to do? Naturally, sexually harass him with the excuse that it's simply just a little skinship between friends until he gives in.

Misaki Marei is a second year in high school, and she sucks at studying. She has no real goals in life, and has zero interest in taking the college entrance exam...until her childhood best friend, Micchan, says she's going to college. Now Marei has found her goal: pass the entrance exam for Akamon University, an elite college, and go to school with Micchan.

(tagged both shoujo ai and yuri for now because it's not clear to me which is accurate / more accurate. several Japanese Amazon reviews of this manga mention "yuri", but we all know there's no distinction made in Japanese)

New Manga UP! romantic comedy about a freeter who ended up falling in love with a single mother.

Part of [THE iDOLM@STER](https://mangadex.org/?page=search&title=iDOLM%40STER) series.

The sun's rays enter the city of light, as various stories unfold:
Bright, dark and harsh; a story filled with people from whom you'd want to avert your eyes. Yet, it's close to reality; so maybe it's true to humanity.
Like an old bond between a boy and a girl, a friendship is born between girls who rarely speak to each other.
A man who dirties his hands for money, and the girlfriend who waits for him to come home.