The Koinobori yakuza family's souls are expensive commodoties, a source of great pride to those of the demon world's soul bank. But when the Koinobori heir, Ryuji, is born with a pure soul engrossed with fairies and angels, it's up to Maria to become his personal cupid and reform him so that he continues the Koinobori's lascivious family line!

Kang Hyunmoo is a dirt-poor man whose dreams of becoming a hunter were torn apart.
But one day, while he was dreaming of getting rich quick, something appeared in front of him…

[Difficulty: Hell. You are entering the Star of Apocalypse.]
“…What?”

He’ll now be monopolizing items and skills in a future Earth overrun with monsters!

From ShoujoHearts:

Ayaka, who works at the Bridal department at a hotel, has a beauty that everyone recognizes, yet her personality is the worst. Everyone calls her a "wicked woman" after the way she wraps numerous men around her finger. The one who sets his eyes on her is the hotel's new executive Tougou, who is the son of a very powerful person of the town. What are the orders that this King-like man requests of her!?

A boy becomes enamored with Ribbon (rhythmic gymnastics) after seeing a young woman dancing by a shrine one evening. Years later, he steps onto the mat for a Ribbon competition. Everyone is shocked to see a boy trying to compete. Can he get past the stigma and dance on equal footing?

The everyday life of Nakano, a salaryman working for an exploitative company, is suddenly intruded upon by the Kitsune, Senko-san (800 Years Old - Young Wife). Whether it be cooking, cleaning, or special Service(?)... she'll heal his exhaustion with her tender "care".

In Himi city, where handball is the most popular sport and famous schools come to scout the players, there's Hinezumi High School, the only public school. After going to the inter high 4 years ago, they want to come back there and recover their glory. And for that they have established a height rule, preventing small players to enter the club since height equals power and they don't want small players who can do nothing against bigger opponents.

Now Shiguma Eito, small first year who came from Tokyo, is fixated on joining the club since handball is the thing he wants to do...

“There’s still more to do, that’s why I need more time”.
With a strong determination, the old man picked up his Rejuvenation potion. The secret of this particular potion is that it rejuvenates the body while preserving the person’s memory. Essentially the fountain of youth. The old man took it anyways and it took a while for the potion to take effect.
--500 years passed…
The man, or young boy at this moment, awoke and found himself in the same world yet different. Nations disappeared, Regression of Civilization, decline in human skills and even basic alchemy has been lost!
Lost Knowledge, Lost Technology! Nothing impossible in the mastery of alchemy!

Naoki Tozawa is adamant in his aim to grow into a man among men, so he decided to go to an all-boys high school with a long history of providing strong and tenacious men for society. However, he is shocked and dismayed when he discovers that after a year of attending the school, many of the students have started coming to school dressed as girls. Rumor has it that the cause of this is a member of the photography club, leading Naoki to confront Ueda, a boy in the club who makes a very convincing girl.

In this world, Makai, every Demon gets a Familiar summoned using their magic. Patty, a Demon Girl who's magic is so weak she can't even summon an animal is forced to get a famliar. So, reluctantly, she chooses an older human named Norman as her familiar. Norman has an incredible fascination with examining all types of lifeforms around Makai, claiming he loves learning about them. This weird combination of a weak demon girl and a goofy old man leads to a journey of adventures the two go through.

The brave tale of the peerless Great Emperor Leonard the First was evaluated as a universal truth.
However, in his younger days, before he managed to unify the continent, he was a boorish and clumsy young man, he got his homeland taken away from him and was branded with the infamous name of “Nosferatu”. This is the story of a great counterattack, a great revolt.

Leonard vowed to recover his homeland and truly became a mighty warrior. Several great generals, sages, talented women and geniuses comparable to gods and demons got attracted to the single-minded Leonard and congregated around him. Eventually, they became a great force able to engulf their depraved fatherland and contended against rival countries.

One day, the world transformed into a game.
'Dungeons' and 'monsters' emerged in the middle of cities, and 'players' who had received the gods' authority appeared.

Se-jun Lee, the guildmaster of the Messiah Guild that would bring salvation to the world.
"Let us save the world together. Let's put an end to this nightmare."
The whole world celebrated the hero's appearance,
And I became his comrade.

But...

He wasn't a hero nor a messiah like the world was hailing him.
He was a deceitful hero with the secret ambition to rule the world.
"You did well. If it weren't for you, I couldn't have come up till here."
I lost my life at his blade in the last dungeon.

...or so i thought.

The announcement I heard next to my ear the moment I died.
[Starting the game.]
I returned to the past, back when I still hadn't awakened as a player.

And this time, It's my turn......

To 'hunt' him.

There's the flower of Takamine which every boy admires, Hanae Riko.
Than, there's the plain boy who got proposed to by that most beautiful girl in school, Niiyama Minato.
Without knowing what's happening, the curtains on these two's newlywed life rises!
For some reason, my bride who's too cute and happily follows me around everywhere refuses to leave my side...

Countless tombstones stand in rows throughout a small community, forming a bizarre tableau. What fate awaits a brother and sister after a traffic accident in this town of the dead? In another tale, a girl falls silent, her tongue transformed into a slug. Can a friend save her? Then, when a young man moves to a new town, he finds the house next door has only a single window. What does his grotesque neighbor want, calling out to him every evening from that lone window?

Naoe-kun is a massage therapist at the "Smiley Boar" clinic. One day he gets a new patient named Erufuda-san, who turns out to be an Elf from a different world. All the junk food of this world has taken its toll on her figure. Now she'll try to lose weight with the help of her trusty massage therapist. But Erufuda isn't the only one from her world who's been affected.

Following her mother’s passing, Midori is now not only responsible for raising her little brother, Ai, but she’s also tied down by housework and other school commitments, making it hard to establish any form of social life... Until she meets a man in the courtyard at school. Will he change her life or will she change him?

Abel was a genius magician who held immense power in a world where the color of your eyes indicates how powerful you are. However, the strength that came with his amber eyes was so great, even his comrades looked at him with fear and contempt. He therefore decided to transfer his soul far into the future, hoping to find a paradise that accepts him. He would soon find out that people’s attitude regarding his eye color did change, but not quite the way he had imagined…

Meet Haruka Kawatsuji, a young boy who miraculously survived a fall from his apartment's balcony as a child. Unfortunately, despite his best efforts to find that same thrill in sports and horror movies, he's never quite managed to feel as alive since. However, that may all be about to change in a fateful encounter with one very eccentric girl!

This is a story about a young man named Rizel, the prime minister in a fantasy world who is suddenly transferred to another world. However, with his brains and his unique speech, he partners with a man named Jill and becomes a brilliant adventurer.

Though he doesn't know whether he can return to his own world, Rizel will 'think of this as a vacation to enjoy another world's life'. The laidback adventures of a leisurely aristocrat!

Author's note: The protagonist forges many male friendships where deep camaraderie is present, so much so that it is necessary I assert there are no romantic feelings involved and therefore not BL.

From mangaupdates:

Born into a wealthy family, she lost her mother at a young age.
She is Riona, a girl who was raised by a single father.
At the girls' school she attends, she has many friends and a special partner of hers,
She lives feeling a little lonely that her busy father has just left her house.

One day, her father bought a robot that she said was her "housemaid"
She witnessed the act of "Forty"...?

A girl who wants her affection and a robot who doesn't know her feelings.
A dramatic story of gems!

From Phoenix Serenade Scans:

Meet Colette, a young doctor. Since she's the only doctor in town, she has to attend to everything, and quite honestly, she thinks she needs a break. One day, she's so frazzled that she jumps into a well. But, she didn't die? Instead, she finds herself in the underworld, where she encounters Lord Hades. Somehow or the other, she becomes Hades' doctor. Follow Colette in her new (though still busy) life, now with Hades thrown into the picture!