The main character is Pan Gamma Vi Gen. He is the captain of the legendary black vessel. Pan Gamma Vi Gen is lazy and clumsy -- that is him when is resting. But once Pan decides to work, he is the best man available. Pan says things that normal people can hardly understand. And he doesn't say much, he only gives lots of clues.
Everything starts when Captain Pan let Mia and Tuban Sanoo be aboard. Mia is a princess of a fallen country and Tuban is the best, people say, swordsman as well as strategist. Although Pan Gamma Vi Gen is the main character, it seems Pan, Mia and Tuban are the main characters as Mia and Tuban appear in all episodes. Mia is looking for science to restore her county, Ontana. Tuban is protecting Mia as the will of someone Tuban trusted. Pan Gamma Vi Gen agreed to take Mia to where she could locate the science in exchange of her virginity. (Don't get Pan wrong here, I believe he meant something else but at this moment, Mia's virginity is all I can guess.)

I came here with only the goal of revenge.

I overthrew the Tulkan Empire, a single nation that dominated the continent.

I had always succeeded in gaining victory. I had accomplished all I needed to and was satisfied.

That’s why I accepted my approaching death. I no longer had a reason to live.

And so my heart stopped beating.

I definitely felt it stop.

However, what in the world happened?

“It’s not black magic and it doesn’t seem like an illusion either.”

A boy with short, black hair was reflected in the mirror.

I looked exactly like when I was 14, which was 20 years ago. A young boy, who hasn’t lost his baby fat yet, patted his cheeks and murmured, “How is this possible?”.

I had returned.

To the time filled with my regrets.

The largest rise of Dark Skin Gyaru's of this century! The start of high school life with best and strongest girls out there!! High School Teacher Imada Sasamichi has been assigned to work there at this school, only to find out that everyone in the class is a dark skinned gyaru!!!! Kuroi, Kuroiwa, Kuroiso...all the names are Kuro (Black)!!! Meanwhile, Kuroi Mariko already fell in love with her sensei...!? It's the start of these lust-filled girls straight love-attacks on Sensei's life!

Milia, the great witch who has reached the pinnacle of evil, has fallen in love for the first time... with her arch nemesis "The Hero"?! She has the highest magical power, but her experience in love is nil. Now the witch begins her quest to discover more of this "Love" in this romantic comedy!

The continuation of the Q.E.D. series under Shounen Magazine R.

Her best friend and her husband cheated on her. If that were not enough, he killed her, his terminally ill wife. Ji Won, who died like that, miraculously returned to ten years earlier. In order to change her future, Ji Won pledged to hand over her ill fate to her "best friend" Soomin.

'So, marry my husband instead of me.'

From Tokyopop:

In real life, Roto, Boromid and Ah-Dol are average kids with average problems, but in the virtual world of Lost Saga, they're heroes. They might even become legends... if they can stop bickering long enough to level up. Whether it's werewolves running rampant or a gorgeous pair of troublesome thieves, our boys must be ready for anything, because in Lost Saga nothing is what it seems and murder can happen with a click of a mouse.

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The series centers on the main character Jang-Gun and his friends along with their virtual reality avatars in the computer game world called "Lost Saga". When Jang-Gun logs on as a different character, he "Creates" an AI with a personality from the hacked disk he found when renewing his appearance for his once a year renewal process. Yureka is a flutter-brained, but advanced, AI with powerful stats and a real-life doppelganger. It is his turn to see just how deep his immersion in the virtual world goes.

From CMX Manga:
This suspenseful, supernatural series tells the tale of Canon, the only student to escape from a bloody vampire attack that took the lives of her fellow classmates and turned her into one of the undead. Struggling against the terrible needs that compel her, Canon commits herself to use her powers for good and do whatever she can to avenge the deaths of her friends and her own terrible fate. Joining forces with a talking, vampire crow, she begins her quest to find Rodd, Lord of the Vampires.

Helga Yttri, a half-noble lady who inherited the blood of a lowly maid.

A bastard child whose position was switched by the Duke's maid; a Fake child.

Helga gave her everything to be recognised as the real daughter.

"Your Grace! The real Young Miss is alive."
"She goes by the name Hyllian...!"

Helga prayed to God countless times so that the real Young Miss never returned.

" ...don't come back, Hyllian."
"Don't come back, please."

She wondered if her prayers failed to reach God because she was a fake daughter.

"Dear God, I've been praying countless times."
"I asked you never to let 'that child' return."

The prayers she howled until her throat went hoarse were all in vain.

"The real daughter of the House of Yttri, Hyllian... The child who will destroy my whole world."

The real daughter is back.

From NHFH Scanlations:

Sakurako Kawawa has moved into a boarding house to attend high school, excitedly waiting her first meeting with her new roommate. And who should arrive at her door but Kasumi Yamabuki?
Kasumi is absolutely stunning, but she marches at the beat of her own drum. Her carelessness awakens the "big sister" inside of Sakurako.

Having given up on both study and dreams, Meguri Sakamoto ended his lacklustre high school life.
But, on the day of the graduation ceremony, the dissappearance of his ex-girlfriend and now famous musician Chika Nito, has been reported in the news?!
Starting with a time leap, this is a love story about redoing one's youth.

A catastrophic event has thrust the world into an age where disease begets disease. Ostracized for his unconventional treatment methods, the dark Doctor Ikuru is stricken with an immortalizing disease. On a desperate mission to die, he must save a world desperate to live. This medical science-fiction adventure will go to the very edge of humanity and back in one man's search for an ending to his suffering, all while saving the world he wishes to leave.

(Source: MANGA Plus)

Note: The manga got originally published as a short series of 4 chapters on February, 2020 in Shounen Jump +. On September 6, 2022, the manga got serialized and its 4 original chapters got republished as part of the serialization.

There exists an evil organisation that intends to invade planet Earth.
The man called "General" fights everyday against the Earth's Defence Force, the "Rangers"!

However, today is his day off.

Mag (Magu) was gifted the skill [Decoy], a skill capable of attracting monsters and causing disasters. As such, he was banished from the city. Therefore, he decided to live alone in a hunting cabin deep in the mountains.
However, there, he draws the attention of Divine Beasts: Loa the Dragon (a beautiful girl), Fiana the Phoenix (another beautiful girl), and Maera the Kelpie (another beautiful girl).
In the end, Mag decides to spend a easygoing life in the mountains with the Divine Beasts. But the skill [Decoy] is not making it easy for him …

Year 20XX, strange phenomena started to occur all around Japan. The best way to explain it would be a ''hole'' that connects different worlds to our world. Many otherworldly beings - magicians, demons, robots and other fantasy creatures started to appear on this side, with no way to return. With the time passing, Japan was able to adapt to this event and visitors from another world stopped to be anything unusual.
And so, an unlucky witch named Henrietta was pulled through the ''hole'' and ended in modern day Japan without a way to return. How will she be able to live in this different world?

Youichi is a very serious, stoic young man with a girlfriend and a regular sex life. However, he has never experienced sexual self-gratification. Recently, he's become aware of a book called "Masturbation" at the library he works at -- an educated discourse into the history of the sin of Onan and related practices. Finding himself increasingly intrigued by the concepts within, he begins to conduct a series of experiments ... Join him as he embarks into a whole new world!

The kingdom's mercenary Ordoll, also known as the "War Demon", is feared by enemies and allies alike.
Although he is meant to win every battle, he is "assassinated" the day after a cease-fire agreement with a neighboring country is concluded.
After pretending to be dead, he manages to escape and decides to head home, shaving his beard and shortening his long hair.
Immediately before arriving at the village, Ordoll picks up a five-year-old little girl who calls him her "papa".
The strongest mercenary, who suddenly becomes the father of a 5-year-old child (♀) even though he isn't married, eventually develops into the strongest parent!

Manga supplementary of Yoko Taro's mobile game SINoALICE.

A status window appeared in front of Ryu Young-jun, a researcher at a pharmaceutical company.
Rosalin's status window, an artificial cell that knows everything about biology.

Ochiai, a salaryman working at a black company, is on his way home, on the verge of mental breakdown. He wants to die. But he doesn't want to die hungry! He passes by a ramen cart run by a young girl named Kira, with the sign "Shinigami Ramen." Kira calls herself a "Shinigami" (god of death) and offers Ochiai a bowl of ramen that's so good that it will allow him to die in peace if he eats it. Will he be able to enjoy the ramen and pass on, or not? Even if he doesn't die, the cute loli-reaper will give him hope for life!