"THE NEW GATE", an online game that trapped its players and turned into a death game, was now releasing the thousands of players that had been dragged into it, thanks to the efforts of Shin, one of the most powerful players. But after having defeated the last boss and freed everyone, he was swallowed up by a strange light and found himself inside the game world 500 years in the future and unable to leave.

I’d been stanning the hero for 3 years when I was suddenly caught red-handed by his tyrannical doting father, Duke Hades Louvremont.

“Ceaseless pursuit, expensive gifts, and now you’ve come alone all this way up north with no regard for your life…”
“I’m sorry. I have no excuse.”
“Alright, I’ve lost. Your devotion is undeniable.”
“...You think so too? Even I admit that this is the pinnacle of devotion.”
“Many women have pursued me, but none as persistently as you. I stand amazed. Let’s hold it, then. Our wedding. As soon as possible."
“Ha... Yes, I’ll accept my fate.”

Silence.

“Wait, pardon?! What?”

What did he just say?
Surely I must've misheard?
But the duke, smirking at my shocked face, gave the finishing blow.
“I said, I’ll marry you.”

Wow.
The hero’s dad has an inflated ego.

As an elementary schooler, Araki Yuuhei saw a live music show and was deeply inspired. Now in middle school, he reunites with his music-loving friend Matarou and gets a strange crescent-shaped guitar. From there, Yuuhei becomes obsessed with guitar and ends up performing at his first live show with Matarou!

Shimazu Toyohisa, a real-life samurai who fought in the pivotal Battle of Sekigahara. In his dying moments, Shimazu is transported to a world of magic with other famous warriors throughout history. These warriors are forced to fight each other in an endless battle.

Note: Nominated for the 4th and 5th Manga Taishou Awards.

From Transcendence:

On a hill overlooking the sea, in a town that retains its old-world beauty, a new and gentle love story begins!

The Gyaru sitting next to me is always sucking on a candy (or lollipop). She makes a "lero-lero" sound with her long tongue, as if she's trying to provoke me!

Any healthy boy going through puberty would look at that with a perverted eye, right?! Don't look... Don't look, me! If she finds out I'm looking at her in a lewd way, my school life is over...!!

In this new action-comedy, everything about a young man named Saitama screams "AVERAGE," from his lifeless expression, to his bald head, to his unimpressive physique. However, this average-looking fellow doesn't have your average problem... He's actually a superhero that's looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!

Note: Nominated for the 7th annual Manga Taishou Award in 2014. Won the 2017 Sugoi Japan Award. The manga also was nominated for an Eisner Award in 2015 and a Harvey Award in 2016.

From ANN:

The story revolves around Tomoya Mizuhara, a 13-year-old boy who suddenly gains a big sister when his father remarries. 17-year-old Ichika is a little strange, and her affection for Tomoya is rather overwhelming, if not scary. On top of things, Ichika's friend Ruri is the ultimate sadist. Then there is Ichika's big-breasted quarter-Japanese friend Marina.

Several decades have passed since the Hero defeated the Demon King and brought peace to the world, and the Hero has grown old enough to only vaguely remember his magic spells. When the remnants of the Demon King's army attack the Hero, he decides to set out on a journey again. This time, it's not a journey to save the world, but a "death preparation journey" to look back on his life.

For years, the commander of the knights, Warrena, has contributed to keeping the kingdom at peace. Despite surviving a year-long campaign, his fiancée, the third princess, became pregnant on top of having an affair. In order to cover up the family scandal, the royal family declared that Warrena had passed away during the campaign.

He gives up on his kingdom out of despair and decides to use his compensation money to live a slow and leisurely life in the countryside. One by one, he encounters a saint and a fox girl, and they eventually end up falling for him. However, he himself has a reason why he can’t fall in love with them...?!
Original Web Novel: https://ncode.syosetu.com/n2267ic/

Towa was reincarnated in the same other world for the second time. There, although time had passed since his first reincarnation, his friends at the time were spending their days feeling too heavy for Towa...

“Isn't it okay to stay by your side forever?” "If you disappear again, I'll die and chase you this time!?"

The beautiful elf they meet again and the sexy succubus heroine press for physical contact as if to make up for the time they lost, and Towa, now a young boy, is violently approached...?

“Towa, could you please take me too?”

A harem fantasy begins with the heroines who have feelings for each other after reincarnating for the second time!

When he realized it, the protagonist was in another world and had become a sword that was stabbed on an altar in a great plain, crowded with devil beast. The world he was in had a game like system; HP, MP, Strength, Vitality, Agility, Intelligence, Dexterity, Titles and Equipment. Following his instinct as a living sword, he traveled to find the one who could be his wielder, until he met with a cat girl that was about to be attacked by a bear type devil beast.

Orginal Webcomic

Kashumir grew up working as a mercenary to buy medicine for her precious younger half-sister, Aria.On her way home, after completing a mission as usual, she tripped and hit her head, causing her to remember her past life; thus she realized she had been reborn in the world of the novel *The Night of the Fairy*. Her sister was the main character of this reverse-harem romance while she was one of the villains causing Aria to suffer hardships.Since there is no way Kashumir would let her precious sister suffer, she vowed to protect Aria until her adoption into the count's family, just like in the novel.But things turned out differently, and even the male lead candidates, who should've been fish in Aria's pond, all ended up becoming obsessed with Kashumir instead, when all she wanted was to protect her lovely sister.

Boot Hour, Shoot Curse is a VRMMORPG that has no concept of levels or professions. Instead, players must farm experience points to gain new skills and increase their status.
Rare, a girl who participated in the closed beta test, has acquired the hidden skill Subordinate, which allows her to turn NPCs into her subordinates. The skill also transfers the experience points gained by the subordinates to Rare. She used the skill to gradually add new NPCs she encountered to her party. As a result of the unprecedented amount of experience gained from her minions, she was able to evolve into a Demon Lord.

『The Overwhelming Adoration of the Sweethearted Lady!』

Alicia Ozrind, known in noble circles as the Frost Duchess, is feared for her cold and unyielding demeanor, earning her the reputation of a villainess among the aristocracy. But beneath her icy exterior lies a girl who simply struggles to express her true feelings. There is, however, one person who has melted her frozen heart—a young servant named Gray, who works as a cleaner in her grand estate.

"You’re the only one who truly understands me!"

Completely smitten and vulnerable around Gray, Alicia showers him with unrestrained affection. Whether it’s during meals, in the bath, or even before bedtime, her overwhelming sweetness knows no bounds! But their relationship isn’t without its hurdles—Alicia is a noble lady, and Gray a mere commoner.

Will Gray manage to endure the relentless love of this endearing aristocrat? This is a sugary-sweet, heart-melting romantic comedy set in a fantasy world!

From MangaHelpers :
High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, powerful others in this world aren't as thrilled to have him there, and they kick him to the edge of the world just as Tsukuyomi declares that he must leave Makoto to find his own way. Now it's up to Makoto to find his own way.

The story is set in the modern world, but there exist doors that can take people to the "other side," where strange urban legends and internet stories prove to be true. College student Sorawo Kamikoshi finds herself exploring one of these doors, and almost dies on the other side, when she is rescued by another girl named Toriko Nishina. Toriko is mysterious girl, but very skilled with a gun, and she seems to be searching for someone else on the other side. Together, both girls start to explore these doors to the other side.

Gone are the days of swordsmanship and chivalry. Now is the age of gunpowder and war. Our story has two players. The first is Orcsen, a unified nation with many demonic races, led by the oft-reviled orcs. And the second is Elfind, the kingdom ruled by the beautiful yet vainglorious elves. Dineru, chieftain of the dark elves, has been forced to flee her homeland from enemies she had once trusted as friends. In the midst of their forced diaspora, she has a fated encounter with the leader of Orcsen, the orc king Gustav...

"I've been cheating on you. Oh, and it's not just one guy. It's three. Sorry about that."

Back in middle school, Akiyoshi Sunao's first-ever girlfriend shattered his heart, and he swore off love. However, all that changes when he develops a crush on a girl in his university's film club. Just as he's finally beginning to move on from the past, he bumps into his ex-girlfriend. Little does he know that this is only the beginning...

To his horror, he wakes up in her body the next morning!

Eiyuu (A.U.), a high school boy, has a problem! Two childhood friends "Shio" and "Akari" who go to the same high school are too cute! If they find out that I'm the only one looking sexually at them now that they've grown up, even though I have no intention of doing so... that would be too much! On the other hand, the two childhood friends also have their own secrets...? It's so awkward! It's complicated! But childhood friends are the best! A sweet and impatient love triangle love comedy where you can't be honest!