“The “Footstamp operation” … … what the hell really happened there!?”
Okinawa, summer of 2112 before Tsunemori Akane is assigned to Division 1 of the Public Safety Bureau Criminal Investigation Department.
Sugou Teppei, belonging to the 15th unit of the joint task force of the National Defense Forces, is taking part to a military operation as an excellent pilot.
Three months later, a case where an unmanned armed drone attacks Tokyo and the Ministry of Defense begins.
In order to investigate the case, Masaoka Tomomi, enforcer at the Criminal Investigation Department’s Division 1 who went to the National Defense military base, comes near the truth behind the case with Sugou.

Jan Akiyama, a cocky arrogant teenager wants to fulfill his grandfathers wish of defeating his arch nemesis Mutsuju Gobancho. When he arrives at the Gobancho restaurant he meets his granddaughter Kiriko Gobancho. Their rivalry is easily compared to Jan's and Kiriko's grandfathers, for Jan believes cooking is about competition and Kiriko believes cooking is about heart.

From Kirei Cake:

Iride Akatsuki is a popular game footage uploader. He wakes up one day to find that he's been kidnapped and taken to a strange place, along with a number of other uploaders who specialize in different genres of games.

A mysterious alpaca-headed host gathers them after the initial stage, to explain how the game will proceed. Will the group of gamers clear the game and make it back to their real lives?

From MangaHelpers:
Tonight, Natsuo loses his virginity. His partner? Her name is Rui and he just met her today after school. She's the one that brought up this whole situation, stating that she wanted to simply gain the knowledge about sex. She does not want to start a relationship, nor does she care about Natsuo.
Afterwards, Natsuo feels guilty for losing his virginity to a girl he doesn't even particularly like. Mostly, it makes him feel like he betrayed his crush to his high school teacher: Hina. A quirky love triangle story unfolds as Natsuo, Rui, and Hina all end up becoming part of the same family.

From Dark Horse:
Misaki Saiki, a young woman with a troubled past, is a professional dominatrix in one of Tokyo's most exclusive S&M clubs. However, her real money is something she likes even less than being a dominatrix. Ever since childhood, Misaki has had the ability to see and communicate with ghosts, and that talent is put to use by the Livelihood Protection Agency, who pairs Misaki with Souichiro Kadotake, a martial artist who happens to be deathly afraid of ghosts. Using her gifts, Misaki is able to help troubled departed spirits resolve what is troubling them and allow them to move on to the afterlife. If all THAT isn't odd enough, Misaki is an albino and a virgin.

A "Eromanga-sensei" spinoff centered around the beautiful and famous young light novel author Yamada Elf. After failed attempts at seducing her dense siscon neighbour Izumi Masamune, she tries it with cooking.

From MangaHelpers:

There's a new wheel-chair bound student at school who has returned after an illness, and she immediately kisses Tsuzuki Ui, who she calls "Rei-kun." He soon deduces that she is a daughter of a wealthy family, and a person he once beat at an internet murder mystery game. She is apparently fixated on him, since he was the only one who ever beat her, and she has now come to see him in person. Her plan is to have a real-life murder mystery game, and her current focus is on the supposed suicide of Tsuzuki's father. For some reason, she suspects his little sister Haruka... [tethysdust]

Super Dragon Ball Heroes: Dark Demon Realm Mission! is a spin-off manga.
It tells the story of the conflict between the Time Patrol and the Dark Empire.

Tenkawa Toichi is a normal, ordinary high school boy, except he has a secret identity - he is a member of the evil Phantom Organization, going by the alias Wolken. They are planning to conquer the Earth, but is being met with opposition from the so-called Angel of Judgement, Mighty Heart (Who, coincidentally, is a classmate of Toichi, Maishima Kokoro). Surprisingly, Mighty Heart is so weak that even Wolken's underlings can beat her easily, but they only figure out her ultimate weapon after Wolken accidentally comes into contact with her body...

Kogane Kokoro wanted to reach out to someone in need in the train but was unable to do so. Then a mysterious old man appeared and took down those goons with his swift movements. Impressed by the heroic appearance, Kokoro decided to become stronger. He became the disciple of the old man and started learning fencing.

what happens when gamers are summoned back to the real world in their game avatars

In the Sengoku Period (1579), there is a young woman who has lost everything, and dedicated herself to seeking strength and a death on the battlefield. Reiri once lived happily with her family, until the day soldiers came by after a battle. Her father, mother and brother sacrificed themselves in order for her to survive. She was only saved with the intervention of Okabe Tanpa no Kami, who had been sheltering in the village. In his service, she grew and learned to fight well, chasing her goal of a death in battle. However, her path to death may not be as short and straight as she hopes.

Its been 15 years after the last Great War. While the scars of wars appear to have vanished on the outside.In truth, the world has become a much harsher place.Follow the journey of Felix and Bay on their quest to find someone from their past.

In the Steins;Gate - Hiyoku Renri no Sweets Honey series:

V.1 - Hiyoku Renri no Sweets Honey

V.2 - Motto Hiyoku Renri no Sweets Honey

----

• Hiyoku Renri no Sweets Honey Final

A group of 5 male high school students that call themselves the funny-face group cause trouble at school with their crazy antics.

Imagine a world where everything you write takes life...What would you do then, if paper which had disappeared for more than two hundred years came back in the of Black Fowl, the biggest criminal mind of the century? An exceptional situation calls for excptional measures. The Police forces of City Hall will have to call to the rescue two of the best of London: Jules Verne and Arthur Conan Doyle!

From MangaHelpers:
High-schooler Matsuzaka Satou has a reputation for being easy, but one day her lifestyle of sleeping with one boy after another comes to an end. It happens when she meets the child Shio, for whom she is convinced she feels true love for the first time. Satou may seem sweet and innocent, but there is nothing she won't do to protect their life together, including committing murder. But from where did she acquire the little girl, and how long can their "Happy Sugar Life" together last?

Included one-shot:
Volume 2: White Sugar Garden, Black Salt Cage (pilot)

Short story:
A short story was released in Young Gangan 23/24 of 2016 which is referred to below as 19.5. It was later released in Volume 6 as an extra.

From Webtoon Live and Shiro Nabi: "Welcome to Survival, 'I Am Unhappy,' the exciting game show to find the world's unhappiest person! The grand prize... is a wish granted by God!" When the victor of the game show wishes for the end of the world, God accepts this wish with a set condition: the world's end would proceed over the course of 100 days, and during that time, he is allowed to 'change his mind' only once. Oh Duk Hee, a quirky comic artist who specializes in unhappiness, is chosen by God to to make the unhappiest person on Earth happy again. With the pressure of mankind's destruction riding on her shoulders, will she be able to change his mind before it's too late? The competition to choose the world's unhappiest human?! The hybrid school fantasy action story by Jung Pil Won!

Ueno Ittou is a kind and tall high school student raised by a single mom. One day when he gets home he finds an empty house and no signs of his mother, she has left him... In that moment, a mysterious girl offers him a job with upfront payment. The job is to take care of the Josei manga author, Nobara Hifumi!