Art served as the butler to the incredibly selfish Lady Wenty. After collapsing from overwork, he was cast out. Lost on the street, the infamous Ice Princess, Urk, appears before him. This is an Isekai fantasy where the butler uses his original magic and butler skills!”

From NovelUpdates:

The high school girl Manami who had fallen down the emergency stairs at school had, before she noticed, become a three year old in the world of an Otome Game. What’s more, that little girl was one of the rival characters that appeared in the game; the can’t-take-a-hint-burikko-type-rival daughter of a marquis family. What awaited her at the end was social obliteration. Though she did get a bad feeling about this… Manami decided not to worry! It was a dream after all, so that had nothing to do with her. For now, she’s going to master magic! Hooray!

Like in the famous Osamu Dazai's book "No Longer Human"/ "Disqualified From Being Human" (Ningen Shikkaku) , the protagonist of this story attempts a double suicide with his lover... except he gets hit by a truck and summoned to another world instead.
Now he wants to find his lover, so he can commit suicide with her.

Harold is the descendant of the hero who defeated the evil demon king. In this peaceful era, Harold has become a convenient handyman for the townsfolk.

One day, a sacred book predicting the world's destruction is discovered. The condition to avert this catastrophe is... "you must complete the 'Newlyweds Quest' with the demon king's daughter." Thus begins Harold's unexpected married life with Yona, the demon king's daughter.

While Harold still feels bewildered by all this, not only can Yona perfectly handle the household chores, she sweetly pampers him when he's tired. However, she harbors a secret...

Class queen Manami Fuwa has been gaining weight lately.

To make matters worse, a rival girl is taunting her in class, calling her a "muscle ball with money".

When Taichi Utsuki can't contain his thoughts about her weight, he's forced to accompany Fuwa on her diet!

A romantic comedy of dieting with a violent, irrational, selfish girl with no sense of emotional distance begins.

Hinowa Tomari is a normal high schooler, until one day he's told that he has to become the wife of a mysterious creature called Kanenogi.

This is the start of their newly married life.

The manga follows the adventures of a young office lady who is also a fujoshi. With the arrival of two new colleagues: Hongou (32), a mature man whose face doesn't show any emotion, and Daichi (25), a bright young man full of life; it's hard for her not to imagine these two in torrid situations...

Ko likes girls. Including his childhood friend from next door Mana, who treats him like a brother. She's popular with the boys because of her physical development... or not! The beginning of a sanctuary of fetishism as Ko conquers the uniformed girl!

Akito Shirasawa, a high school boy whose father is a film director, sees something in the library preparation room. It was the "masturbation scene" of his classmate, Natsuho Honjo. Akito is puzzled, but ends up filming it with his smartphone. Natsuho notices Akito, and in the men's restroom, makes a "proposal" to Akito! Exposed high school girl and movie boy. The "exposed love" of twisted adolescence, begins!

Mangaka's Twitter: https://twitter.com/UMA_raclette

Amano, who returned to the city where he lived as a child for the first time in 10 years, meet Yukio Sawatari, a childhood friend on the first day of transfer, when he (a male friend) turned female! Although she shares her joy, as she suddenly turns into a girl and cannot hide her embarrassment. Yukio was affected by an illness like 100,000 other people, suddenly becoming a girl so-called " spontaneous isomerism metamorphosis ''!

The female childhood friend ♂ is cute and in trouble!? Forbidden TSF (transsexual) Love!

Scammer Seiichi Sagino's mission this time is to stop Ren Karasuma, a police officer with a sharper sense of crime. At the beginning of their encounter, Sagino is told that he smells like a criminal. Will this action lead to unexpected developments...?

A middle-aged detective, Eiji Kirisame (40), meets a strange high school girl at the scene of a certain crime. She doesn't speak a word, but she helps solve the case using her drawings. However, suddenly this middle-aged detective is getting a marriage proposal from this girl!

She has the looks of a model that stands out from the crowd, and on top of that, she has a great personality, too. Daily life with such a sister must seem quite strange to other people.......? This is a romantic comedy about a boy who will "definitely" get together with a cute little sister in the end!

(Source: ComicWalker, translated)

One young salaryman, who adores his plug-in, hybrid car that uses both electricity and gasoline, had been using camping in it as an escape plan from everyday life. Suddenly, he finds himself transported to another world with his car!

He'll start his life anew in this different world!

Leon was reincarnated in the world of an otome game that he was forced by his sister to conquer just before his death. He tried to live a peaceful life as a mob character, but he encountered a scene where a female student ignored the flow of the story and tried to become the main character. Leon ended up seizing Marie, a girl who had a similar atmosphere to his sister from his previous life, and succeeded in thwarting the scheme. It should have have been the right choice... but why was he feeling uneasy about it?

An ignorant friend of a certain thirsty(?) wife.

Kyoto has become a place where humans and monsters have chosen to coexist, and Chimi-Mouryo has become rampant. Saki, a succubus who attends a school in Kyoto that has turned into a magical land, uses her beauty and abilities to become the school's princess!!

Even such a reckless girl had a natural enemy. His name is Ashiya Yuu! A tough-looking man who won't fall for only himself and is loved by other demi-humans!!!

Saki, who calls herself the queen, can't stand this sight, so she tries to bring down Ashiya faster than the other demi-humans, but...!!?

The story is set in a pawn shop in a working-class neighborhood, Shitamachi, and it follows Shinobu and Aki, two people fascinated by sparkling jewels metaphorically "born from a distant ancient Earth."

From Freewheeling Scanlations:

Natsuki is teased for being a hopeless romantic, Keiichi disguises his sadism with an angelic grin, Tsuyoshi is an otaku who can't read the air, and Tomoya is a frivolous playboy who likes his archenemy. The rainbow-colored story of (sometimes dubious) friendship and (mis)adventures in love of these four boys who spend their daily high school life by having fun starts when recently-dumped Natsuki received a pack of tissues from a girl wearing Santa costume in the streets on Christmas eve.

The story is set in a “land where two worlds intersect,” and it centers on “a strange romance between a boy and girl who meet by fate.”