From Aerandria Scans:

His name is Itou Hiroyuki, nickname: Hiro-kun. He's a math teacher at the private Taihei Academy, as well as the homeroom teacher of class 3-3. He's young, cool, and tall, and yet, when he's with the male students, it's impossible to tell who are the students. He's the person I love.

This is a sad and gentle story about the 15th winter of a girl who fell in love with her homeroom teacher.

"A World Where Chastity is Reversed"—A dream world where the male-to-female ratio is 1:20, women have stronger sexual desires, and precious men live a smooth life protected by their bodyguards.

Fifteen years have passed since Ikuto Ichise was reincarnated into this world, which should have been a guaranteed harem, but for some reason, he isn't popular. Ikuto laments that it must be because his bodyguards are all handsome men, and especially his childhood friend Rui Toosaka, who is particularly high-spec... but in reality, the bodyguards are beautiful girls disguised as men! Completely unaware, Ikuto is overly close and unguarded, making every girl feel like they have a chance. As he unintentionally forms an oblivious harem, Rui, who wishes to be seen as a girl, reveals everything to him—!?

Thirteen years ago, suddenly the Villainous Army of evil appeared in their gigantic floating castle 10000 meters in the sky to invade Earth! The villainous army have reviving capabilities that make them immortal, making them a serious threat to humanity. To protect us against these invaders, the Divine Dragon Rangers, the Dragon Keepers, wield their miraculous powers and their weapons, Divine Tools, and continuously fight for our safety! The assault of the Villainous Army! The vigilance of the Dragon Keepers! Will they succeed in their conquest…? Find out in the action-packed superhero series of a lifetime!

From Haruba Negi, the creator of 5Toubun no Hanayome.

High school freshman Nao Misumi has known Sena Ikuta, his older sister Rio’s best friend, since he was in elementary school. As a self-proclaimed “sister’s boy”, Nao has always found Sena’s over-familiarity incredibly annoying. Yet, despite being loud, airheaded, and having zero sense of personal space, he could never truly bring himself to hate her. She has always looked out for him just as much as she has for Rio.

She’s a total idiot, too carefree, and her sense of personal space is completely broken. To Nao, she’s supposed to be nothing more than a nuisance, and yet...

“At first, I hated her for sure. She was noisy, and always took the things I cherished. So why is it that now—?”

Even as he grumbles about her constantly calling him “Lil bro," he finds himself unable to leave her alone. How did this “annoying” fixture in his life become the one person he can’t look away from?

Kubo-kun tries to learn about romance for the sake of writing light novels, but he turns out to be the most tactless and clueless person ever!?

Kuzukake Shoutarou is a high school boy whose only family went missing while traveling. The ones who came to his rescue? The strongest stepmothers ever!? Housework and daily life taken care of down to the last detail!!

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.

Kakyu, a former Japanese who was reincarnated as a low-level demon in hell, has acquired unparalleled strength over two thousand years. However, unexpectedly, he is exiled to another “different world,” liberated from the harsh underworld.

Kakyu, who was enjoying his dream slow life, witnesses the village he owes everything to being attacked. Despite rushing to the scene, the village is annihilated.

Picking up the only surviving baby, Alus, Kakyu resolves to raise Alus to become the happiest person in the world to repay the debt…!?

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction. As the Shield Hero, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!

One day, the protagonist Allen, who has been reincarnated from Japan into another world, realizes that his unique skill, Moon Gate, allows him to travel freely between Japan and the other world. With this power, Allen comes up with the idea of traveling between Japan and the other world and making money by selling various items to people from the other world, those who have been transferred, and those who have been reincarnated, who are hungry for entertainment! Before long, he gets to know the daughter of a large company and the princess of a kingdom in the other world, and enjoys the other world to the fullest...!!

The youngest A-rank adventurer, child prodigy Kaiser, finds three babies who were the only survivor of a destroyed village. Then he decided to give up his job as an adventurer and raise them. Over time, the girls grow brightly and show exceptional talents in fencing, magic and management. However, these girls also seem to love their father, Kaiser!

Orignal webnovel: https://ncode.syosetu.com/n2223fo/

After winning the battle of Katze Plains and founding the Sorcerer Kingdom of Ainz, they aim for a utopia of perpetual continuity and prosperity, a world where many races kneel before Ainz. As the first step toward achieving this goal, Ainz heads to the Empire to strengthen the Adventurer’s Guild and incorporate it into the state. Behind the scenes, the nations of the world are beginning to stir with their own agendas for the Sorcerer Kingdom...! Ainz's high road, once again!

Bookstore manager Tenma hasn't shown up for work or called in today. His employee, Asuka, worried about him, goes to his house and discovers... he's been petrified by his medusa wife! But surely they can return him to normal?

Tenma left a letter saying that if anything happens to him, Asuka should take care of his wife. But Asuka is a guy who can only get excited by other mens' wives. Also, and most importantly for the plot - hot medusa wife.

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

Narumi Rokurou is still adrift in life in his forties, unmarried, and working as an editor at a publishing company while writing hardly lucrative literary fiction. His days enjoying life at his own pace are brought to an end one summer night, when a strange twist of fate brings Rokurou together with a mysterious beauty, beginning the story of their crazed love. As once was spoken by Zarathustra: "Everything in a woman is a riddle."

Third son of a "beggar noble" Nore lost his job and was at a loss. But as he was contemplating whether to become an adventurer fortune struck.

A Hidden Dungeon that no one knows how to get enter. A legendary place full of hidden things like extremely rare magical beasts, magic tools for gaining power and items that would be scarce all over the world. That's the kind of entrance that was opened.

"Without telling anyone about this place I'll secretly become the strongest."

This world is harsh to nobles of poverty. Without authority of honor, if I could at least acquire power――

On a summer afternoon, Nakaba Masaki suddenly confesses his feelings to his classmate Yuzuki Tsubasa, who happens to be alone with him in the classroom after school. He braces himself for the inevitable rejection… but the answer he receives is nothing he could have imagined:

“I’ll go out with you, if you’re willing to date my twin sister too.”

As the red-headed princess of Kouka, Yona lived the ideal, though sheltered, life within the walls of Hiryuu (Red Dragon) Castle. Doted on by her pacifist and cowardly father, King Il, and protected by her childhood friend/bodyguard, Son Hak of the Wind Tribe, (who has loved her since they were kids, but keeps his feelings in check). She cherishes the time she spends with the "love-of-her-life" (and older cousin), Soo-won. Though, on the night of her 16th birthday, everything changes when she witnessed someone close to her, murder her father.

Shirayuki is a young woman born with unique apple-red hair. After catching word about her hair, Prince Rajin sends orders for her to become his concubine. With nowhere else to go, Shirayuki cuts her hair and escapes to a neighboring country. While traversing through the forests, she meets a young man, Zen, who helps her after she boldly cures his wounds. He soon, however, becomes poisoned by an apple meant for Shirayuki. What will happen to Shirayuki? What is Zen's true character? A refreshing fantasy story between an optimistic heroine and a prince who constantly stays on her watch.

Extra stories:
V.1 - Hachigatsu no Shikisa (Four-season Colour of August)
V.2 - Bokura o Tsunaide. (Bind Us)
V.14 - Natsu Yasumi Zero Zero Nichime

In an attempt to win her homeroom teacher's heart, Itsumi Toudou purchashed a shady love potion, and tested it out on her stuck-up student committee president, Yomotsuka. Now, she has an uncharacteristically affectionate girl to deal with, and she's not even a lesbian! Right?