An elemantary schooler, Usami Kyuu encounter Ichiko, a female robot trying to learn about [heart]. What awaits the two that start to live together... Boy X Robot Girl, Begin!

Typical company employee Tanaka Daichi (38 years old, single) loves games and plays a new type of VRMMO called "One More Free Life Online" under the username "Earth". Inside this free world he chose several skills that are generally regarded as useless. Be it wasting time crafting potions, cooking up pointlessly tasty food, or hunting monsters with some absurd weapon he crafted, he simply enjoys playing the game.

Web Manga

From MangaHelpers:
A young noblewoman once dreamed of becoming a magic user like in the old tales, but her time in magic school has dimmed her passion. One day, a mysterious man comes to her rescue in the forest, using magic like in the old stories. Despite the fact that he is clearly skilled in magic, he is thrilled by the idea of learning new techniques. Since the only way to do that in this day and age is in magic school, he alters his appearance to school-age and decides to accompany her back to school.

Jung Yeonshin was born with a short fate: being unable to live past the age of twenty. Although everyone in his family looked down on him, his skills were remarkable enough for him to create his own martial arts. One day, Yeonshin realized that he doesn’t have much time left to live… This is where Jung Yeonshin, a terminally-ill genius, begins his desperate struggle to survive!

The protagonist Kim Chulsoo works his ass off for a living as a manual laborer in real life and by grinding for and selling items in a game.

He finally gets the chance to switch to a hidden class, hoping for that one big shot in life…!

But the hidden class turns out to be... a Goblin Summoner?!

Shinichi Kudo is a high-school student who, by using observation and deduction, is good at solving mysteries. While investigating one, he is caught by the criminals that he was watching and forced to take an experimental drug. Leaving him for dead, the criminals disappear. Instead of killing him, however, the drug turns Shinichi into a little kid.
To preserve the illusion of his 'disappearance,' Shinichi adopts a new name based on his favorite author (Arthur Conan Doyle) and becomes Conan Edogawa. Ran, his (actually Shinichi's) childhood friend takes this little boy under her wing and brings him to her home.
Conan now lives at a detective agency run by Ran's father, but his mind is as keen as ever and he continues to solve mysteries... always allowing Ran's father to take all the credit.
As far as everyone's concerned, Conan is just a little kid anyway... even to Ran. This is *extremely* frustrating to Conan since nobody will listen to a 'little boy.' Despite this, Conan has a mission... to find the criminals who did this to him and get the antidote to that drug.

Note: Won the 46th Shogakukan Manga Award in the shōnen category in 2001.

When I confessed my love to Sasaki-san... she's floating!? But only by 1 cm off the ground...!
From the novel posting site "monogatary.com," a mysterious youthful romantic comedy about Sasaki-san, who can use a little bit of amazing magic, and me! (From Comic-action)

After losing his girlfriend to a brave hero, Toru is expelled from his S-Rank party. With a feeling of sadness and pain in his heart, he defeats a demon he meets outside the city, and his ability [to save experience] is broken! Toru becomes level 300 in the blink of an eye! With this power that far surpasses that of heroes, there is nothing that can stop him. Kaede, a slave he met on his journey, forms a group called the "Mangyu Brigade", and easily completes dungeons, acquires the legendary sacred weapons, and thanks to his skills, his friends level up easily! He rescued a countess who was attacked by bandits on the road, and befriended a legendary beast. Oru's journey continues at a leisurely pace, as he repeatedly encounters various people along the way, while his former party of heroes are deprived of opportunities to play an active role and fall into decline. This is the beginning of the life of a 300 level warrior!

Original Webnovel: https://ncode.syosetu.com/n9483ge/

Abandoning money, fame and honor, the knight Bard embarks on a journey to find his final resting place. Tasting delicious food, admiring the unfamiliar scenery all by himself, his journey to find a place to die quietly begins.

What he doesn't know however, is that this is the beginning of a new adventure for him.

“Huh?! Kyaaaaak!!! W-Why did I suddenly become an anchovy?!!!”

He majors in food and nutrition and has a first-class certificate as a daily sports instructor, the epitome of being a fitness enthusiast, Choi Young-jik! Well, that was who he used to be…

Waking up in the body of Prince Soo-yang, the second son of King Se-jong the Great, he lost all of his bulging muscles overnight.

Young-jik was taken aback when he realized he might be able to meet King Se-jong, his father. He couldn’t contain his excitement at the thought of meeting the magnificent King Se-jong, whether or not it was a dream or reality.

H-Huh? King Se-jong… the Great???

There sits in front of him, a chubby man who looks like he’s struggling to breath.

King Se-jong the Great appears to be severely obese and possibly diabetic… Government officials had chronic illnesses and frail bodies… Choi Young-jik, a seasoned fitness trainer with 15 years under his belt- holding the pride of the fitness community- begins to feel a fire ignite inside him.

“Alright, shall I try spreading the fitness craze in Joseon?!”

In a dilapidated castle, Astaroth awoke as a Demon King.
With his ‘wisdom from his past life,’ he would rule over his lands as a thorough ‘realist.’

“Demon King, why are you attacking the level 1 Heroes?”
“Defeat them before they become stronger. That is called strategy.”

“Demon King, why are you sending fake money to the enemy country?”
“To bring chaos to their economy, so they will self-destruct.”

“The werewolf troops have attacked. Should we use silver bullets?”
“Not bullets, shoot them with canons.”

And like that, Astaroth ‘reformed’ the old tendencies.
He became a lord who was loved by the people and his subordinates, and he would go on to be called the most powerful Demon King in history.

Kanmuri Ayako owns a watch workshop where many different people visit her — each with their own unique past, anecdotes and thoughts. A heartwarming, gentle story.

From Nyan-Nyan Rampage:

"The final arc of the story begins...

When Takao Osugi receives the mysterious "Universe of the Four Gods" book from his mentor, Einosuke Okuda, he does everything to keep it away from his young daughter, Suzuno. But when disaster strikes Tokyo, can he still protect her from her fate?

Shortly after the tragic finale of Genbu Kaiden, young Suzuno Osugi's tale as the Priestess of Byakko beings to unfold!"

From: Easy Going Scans:
Glory is won over the roar of cannon fire, and peacetime exists simply to prepare for the next battle.
A soldier in a militarily-advanced nation, Balzer had no problems gaining rank. However, his career takes a sudden turn when he's assigned as an adviser at a military school in a neighbouring allied nation. Struggling to manage with minimum military power at hand, inexperienced students to take care of, and civilian opposition against firearms to alleviate, will Major Balzer be able to win over the other soldiers, his charges and the civilians?

A C-rank killer from the assassin organization “Glory Club,” Byun Hogil somehow ends up becoming a lawyer. Where there’s sky, there’s also rock bottom! Set in the same universe as [Killer Pietro], this is the story of our ordinary, small-time citizen-killer Byun Hogil, who never even got close to the legendary Pietro.

“The Hero defeated the Demon King in the war of men against demons…” Those kinds of stories are a thing of the past. Nowadays, adventurers, demons, Heroes, Demon Kings, and so on are all occupations that no longer involve putting one’s life on the line. Peace has returned to the world, and dungeon exploration has now become a form of entertainment. Adventurers and monsters now all fight using clones they’ve created with magic in an extremely popular form of dungeon clearing where nobody dies. The footage of the dungeon getting cleared gets broadcasted all across the continent, and I’m a member of a Hero’s party that was ranked the 4th most popular in the world… but not anymore. Parties had a limitation of 5 members, and I was told that an unpopular job like Black Sorcerer would only get in the way of getting to 3rd place or beyond.

Now that I became unemployed, I was forced to find another party but I just couldn’t find one. One day, I encountered a beautiful blonde red-eyed woman who told me she had a job for me. After being so touched from having someone recognize my abilities far more than my past comrades, I ended up agreeing to take an interview without asking for the details. When I arrived at my destination, I was at the world’s hardest dungeon where no party has ever reached the final area, the Demon King Castle, where the Big Four and the Demon King were waiting for me. This is the story of a Black Sorcerer that was kicked out of a Hero’s party and joined the side of the Demon King Army to repel the Heroes. (Source: Novelupdates)

Or
Please read the title again.

Artist's Twitter (NSFW): https://twitter.com/kana_kkn
Orignal webnovel: https://ncode.syosetu.com/n4836fm/

Sakimori Kagami plays a VRMMORPG called Arch Earth Online. He is a veteran player with the name and appearance similar to an elderly bearded wizard from a certain book about a ring. One day he purchases an appearance change item as a last resort to spend expiring currency and gets the idea of choosing what he would want to look like if his character was ever a girl. Falling asleep should have suspended the game, but Kagami wakes up still online and feels the game has has gotten a bit more realistic. Did Arch Earth Online finally get a long-awaited update?

Norito Yonezawa is a low-energy high schooler with little interest in reality. He can't stop thinking about his classmate, Hochiya. She's the complete opposite of him, eating whenever and wherever she wants with no regard to those around her. Despite this, somehow, he just can't look away...

The high school freshman Kishino Mamoru was expecting a fateful encounter and he met the pretty girl classmate Oshii Koko, and happened to know her secret. To his surprise, he found out Oshii-san's bladder is super weak...!! To not 'leak' this secret, Kishino Mamoru swore to protect Oshii-san('s bladder).

Kurose Ryotaro is a high school student who dreams of becoming a teacher. He admires his teacher, Mr. Shiratori, and is subjected to severe bullying. One day, he is told on the roof by the bullies, who are afraid that their bullying will be exposed. ''Will you kill yourself before your bullying is exposed?'' And. The situation that he couldn't believe his eyes made Kurose step away from the upset… 'Hey, sir. Even so, can't I just do it again?