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.

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 …

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!

Centered around a girl who can control the greatest of beasts as if she was playing a musical instrument. However, she gets embroiled in a war for supremacy between kingdoms.

"In this village, death inevitably takes those who have reached 50 years of age."

By custom, all villagers who have passed the age of 50 are bound and taken to The Netherworld on the other side of the mountain. Officials clad in beast skins manage the village, "The Living World," whose people are watched over by gods. Meanwhile, the People of the Mountain remain shrouded in mystery. Anzu, who sacrificed the older of twin girls to the mountain, is torn between hope and despair.

Land, a story that reflects Yamashita Kazumi's unease for the nation of Japan.

Six years after the JS Incident, a young dimensional traveler Touma Avenir rescues a mysterious mute girl named Lily Strosek from a secret research facility on a distant world of Ruwella. However, by doing so, he becomes an unwitting accomplice in the Book of the Silver Cross Incident, the latest interdimensional crisis faced by the former Riot Force 6 members...

The role of the angels is to evaluate the good deeds of human beings and fulfill the "small wishes" that were in the good deeds. The angel, Ariel, is one of them.

However, what appeared in front of her was a high school girl who didn't have any "small wishes" despite having done tens of thousands of good deeds

Ariel decides to approach the JK ......

Angel (♀) × JK (♀) a little naughty slapstick romantic comedy ♡

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Shouji Osamu is an elementary school teacher fresh out of college about to embark on his first day. At the school gate, he was suddenly hugged by Chise, a girl he doesn't recognize who seems to know him. He later finds out that Chise is a fifth-grade student in his class, and that she lives in the same apartment building as he does. During a late-night rendezvous, he learns that nothing about their encounter is coincidental.

The story of a two-person shogi club: the senpai is obsessed with shogi and making her expressionless kouhai confess.