One day, the diligent and chaste Sister Erna's church is attacked by vampires. The pleasure from the venom in their fangs overwhelms her body and sets her heart and her mind at odds. Thus rises the curtain on a bewitching vampire romance!!

Official Italian Translation: https://www.animeemanga.it/2019/09/12/sister-vampire/

Ever since the death of someone important to me, I’ve been living recklessly. After I became a high school student, there was a girl in my class who remained hospitalized due to “luminescence disease.” This disease is named for the fact that the bodies of those who suffer from it glow faintly when exposed to moonlight, and that glow becomes stronger as their time of death draws closer. The girl’s name is Watarase Mamizu.

After learning that she doesn’t have long to live, and there are things that she wants to do before she dies…

“Will you let me help you with that?”

“Really?”

As this promise was made, the time that had frozen for me began moving again

From Huffly Parfait Scans:

Perched atop a hill with a clear view of the stars, Seigatsu High School is a boarding school specializing in astronomy. The only girl enrolled in Seigatsu High School, Yahisa Tsukiko, lived an idyllic life alongside her two childhood friends, Kanata and Suzuya.

Then one day, Tomoe Yoh arrived, transferring from France. From awkward beginnings, these four opened up to one another and grew to become irreplaceable best friends. But during the spring of their junior year, further changes have been blossoming within their relationship…

A young man is starting as the tutor of a japanese lower house politician's daughter. But this girl means dangerous business.

Yano Shiki, a boy who only shows a facade.
Minase Akiha, a quiet and reserved transfer student.
Minase Haruka, the other side of Akiha.
This is their bizarre love story, one where the distance between them is limitless/zero.

Hana meets a good-looking guy at the train station, then happens to meet him again at a blind date. However, despite his indifferent attitude, Hana discovers that he just might be the person she's been talking to online for the past four years!

This is a romantic comedy about a girl who really, really loves the chase and a tsundere boy in glasses.

[OneGarbageGal]

Matsukawa has all the qualities that would make women fall head over heels at first sight. He’s good looking, has great style, is an excellent worker, treats people with kindness, and even has a great smile. It’s all thanks to his “secret” efforts to make himself look that good. However, he didn’t expect for his co-worker Yuuki, whom he hates, to approach him. A salarymen love story between a gentle yet sadistic junior and a senior obsessed with beauty begins!

With the author's characteristic humour and creativity, the work describes one girl’s fantasy adventure. Yvien Magnolia's beauty widens the small villagers' eyes she is living but she never knew what her future would be, since it is destined too high to imagine for her at that time.... As the lord of the manor tries to kidnap her, Yvien flees to Lowood Institution for wizardry and witchcraft she never thought to go leaving behind her family. In the school, she meets interesting people, like, January Lightsphere who shines purple aura compared to his noble but peculiar family, and Lariatte, an orthodox fighter family's heir, who will be her closest mate.

Poor girl x cold-hearted beauty.

Background illustrations by https://twitter.com/poti1990

Tagami Yusuke, led by a mysterious voice, is summoned to another world, "Caltsio". He was just a young video-game lover, but Fate decided to make him become the "Evil God of Calamity" of this world, obtaining the ability to create and customize everything, Customize Creation.

From Shoujo Manga Maniac:
Shino feels totally lost in her life. She goes out with a past work colleague, Masaki, quite macho... and troubles at her work make her leave it. She moves out, takes her independence, moves away from Masaki and settles in a tiny room in an old building of suburbs. On her arrival, she finds a little garden she shares with her neighbours, a couple her own age. And little by little, she feels more and more attracted to the mysterious man who lives next door.

High school student Tetsu Iwaoka notices that his classmate Mogumu is always alone at school. Wanting to give Mogumo a chance to make some friends, Tetsu invites Mogumu to work at his family’s maid cafe. Although Mogumo is initially enthusiastic, there is just one problem: this is a girlyboy cafe, but Mogumo is adamant about being neither a boy nor a girl.

In a world secretly run from the shadows by magic and those who wish to control it, a mysterious academy trains young witches to seek revenge on a world that treats them like tools. Alice, a young magic prodigy, has been taught to live for this goal - while Mari, an almost powerless human, stumbles through life looking for mutual understanding. However, when Mari’s reasons for attending the school become increasingly clear, Alice must cope with revelations of her own!

Luna has been keeping her powers a secret from other people. One day, she initiates a fire in her house for being distracted, and is there when she comes to know that she's actually a witch. after that, She's summoned by her grandmother and goes to an island to train as a witch... a story about a modern witch and werewolf is about to begin.---------------------------------------------------------------------Original webtoon:http://www.comico.jp/articleList.nhn?titleNo=17790

The creature known as man is quick to misunderstand.
The same applies to the the pure middle-schooler Yokoyama-kun: A diligent fellow who does his infirmary duty properly.
"You're so nice. Thank you." The one to say that to him was his classmate Nishino-san, so Yokoyama-kun ended up thinking: ("Isn't she only nice to me?!")
He couldn't help but be hopeful. ("Does she like me?!")

This is the start of the misleading life between the fantasizing Yokoyama-kun and the equivocator Nishino-san.

A story between the Sea and the Earth. Childhood friends Hikari and Manaka, who live in the sea, together with their friends Kaname and Chisaki, are forced to attend school on land after their own undersea school is closed. But due to a special encounter, their lives gain a new twist.

not Onee x Shota

p.s if I put romance tag, I'll got bullied

From MangaHelpers:
A new program has been set in place for a certain area, where children are separated by gender into eastern and western territories. They're raised with no contact with the opposite sex, and made to only focus on their studies. Of course, there are a few bad apples, and the worst of these are sent to a co-ed school with the troublemakers from both sides. Unfortunately, this school soon became known as a place where the teenagers would battle to determine who was the strongest, and many boys and girls tried to be sent there.
At this school, the girls have an advantage, since the boys mysteriously get nosebleeds whenever they look at them. However, the strongest girl, Jun, is shocked to find that the strongest boy, Kyo, doesn't get a nosebleed when he looks at her! It turns out that both of them have had some experience with the opposite sex in the past, and they both have embarrassing secrets in the present.

A hero is made of H (ecchi) and Ero.