His more-than-friends, less-than-lovers cousin is so cute that he could die!!!!?

Nozomu is a boy staying at his uncle's house over summer vacation. In the countryside, where there are no convenience stores, or any busses even, the boy has a problem. That problem is his younger cousin, Sou! He’s being led around by this tanned, energetic girl day after day and can’t show her the dignity befitting his older age!

On top of that, whether intentional or not, he’s getting flustered by Sou’s inviting demeanor. Eventually, Nozomu couldn’t take his eyes off Sou and is falling more and more under her spell...!!? With a “cousin” like this, his reason is having a hard time hanging on!

This is a romcom with a guy who’s going under from all his tanned cousin’s teasing!

Having graduated from the prestigious Witchcraft Institute at the top of his class, no job is out of reach for William Glenford. But William dreams of only one thing: adventures.

Jirou, a third-year in high school, is forced to live with a gyaru named Akari under a course called the "Couple Practical". In order to be paired with their own romantic interests, they're going to act as a married couple...!?

Kazama Kenji likes to believe he is something of a delinquent. Moreover, others seem to like to agree that he is. Of course, Kenji's gang finds their way to a group of four not-so-normal girls - Chitose, Sakura, Minami and Roka - and all at once, whatever reputation he may have, is nothing compared to the outrageous behavior of the girls. Shanghaied into joining their club, what will happen to his everyday life from that point on?

The second spring at the Advanced Nurturing High School is welcoming Ayanokoji and Class D. The special exams aren't only what awaits them, but the unique freshmen as well. Kazuomi Hōsen and Ryūen. The two who shared the bad reputation between themselves during Ryuen's middle school days. Takuya Yagami, who proclaims to come from the same middle school as Kushida, is approaching her. And the capricious Ichika Amasawa who is pulling Ayanokoji left and right.

One day 's lunch break, suddenly a male high school student Yuzo Ogata being transferred to another world of sword and magic together with four other friends.

According to the Princess of Space-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world.
Suddenly I was surprised at four friends "Temple", but it was a relaxing expression ... ... where the princess told of a startling fact!
"`―― There should only be four braves though?"
"A man who was mistakenly summoned to a different world" What will be in store as to his fate?

Source: http://konomanga.jp/manga/taitei-cheat

Dirty oldman isekai

Fantasy harem-comedy begins with a kind-hearted uncle who helps the weak, crushes the strong while doing some consensual seeding here and there.

D.Gray-man follows the adventures of 15-year-old Allen Walker, whose left arm can transform into a monstrous claw and destroy akuma, evolving machines created by the Millennium Earl to help him destroy humanity. As ordered by his master General Cross Marian, Allen becomes an Exorcist, people who can destroy akuma, for the Black Order, an organization attempting to stop the Earl. He becomes a powerful asset for the Order because he can detect disguised akuma with his left eye. Allen is sent to recover pieces of Innocence, a substance that gives certain people, called Exorcists, the ability to destroy akuma. The Earl decides to call together the Noah Family, superhuman descendants of Noah who can destroy Innocence. Both sides start the search for the Great Heart, the most powerful piece of Innocence that will assure victory to the side that finds it.

Kugayama Hajime, a boy living in the countryside, comes back to his old classmate Momose Akira, whom he used to admire.

Just as he is about to watch her from afar and enjoy his sweet and sour youth, Akira makes an unexpected approach.

And there was a “fate” that was more than he could have imagined.

Alexander Purchinov is president for life of the country of Pursia, a country ruled by violence and the influence of its government. Alexander always desires to be dominant, and "ride" things, whether literally or figuratively. Now that he has already ridden his country, his next target is a fantasy world that has orcs, wyverns, and centaurs.

Conan and the Detective Boys are asked to help kids who have been send backwards in time. These "Time Drifters" explore different eras of Japanese history in search of the Time Stones that will help them return to the present day.

Official Website: https://www.shogakukan.co.jp/pr/ntconan/

《 Today, I’ll confess to Ko-chan! 》 A voice suddenly heard by Kota Nitake, a high school boy who is not particularly popular. It was the voice of Ayano Yumemigasaki, a childhood friend who always has an attitude that doesn’t look like him! Kota didn’t know that Ayano fell in love with him. 《 I really wanted Ko-chan to talk to me … 》 Kota begins to be aware of Ayano’s unrequited love. However, an unexpected side effect of “voice of the heart” ……! ??

One day, Sanada Shirou, who works for a black company, is transported to another world. Using his "creation magic", an ability he gained when transported, he opens an inn and is supposed to lead a slow life, but this other world is a little strange?! It is a world where women are overwhelmingly dominant, where women do dangerous work and battle, and men are powerless and are protected! The daily life of entertaining (in many ways) the women of this other world begins...!

Web novel: https://kakuyomu.jp/works/1177354055503576578

This world consists of two dimensions joined as one, like a mirror. The first is the world in which the humans live, Assiah. The other is the world of demons, Gehenna. Ordinarily, travel between the two, and indeed any kind of contact between the two, is impossible. However, the demons can pass over into this world by possessing anything that exist within it. Satan may be the king of demons, but there's one thing he doesn't have, and that's a substance in the human world which is powerful enough to contain him! For that purpose he created Rin, his son with a human woman, but will his son agree to his plans? Or will he become something else...like an exorcist?

Tao and Alma, a pair of troubleshooters who work in a bustling red-light district, take on any job that requires a solution.

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled….. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

The stories of the everyday life of a black mage and a slime that run a magic store together as master and servant.

Follows the life of a hero who manages to win all battles with only one punch. This ability seems to frustrate him as he no longer feels the thrill and adrenaline of fighting a tough battle, which leads to him questioning his past desire of being strong.

The perfectionist class president, Tsukamoto Anne, has one small problem: a gyaru in her class, Kenzaki Kaoru, is so exceptionally dumb that she's in danger of repeating the year! However, Kenzaki Kaoru has one small problem of her own: the class president, Tsukamoto Anne, is exacly the kind of person she worships as a god-like fave! The serious class president wants her reign to be perfect, while the creepy otaku gyaru wants to hide her true nature—and so, a battle between the two begins!

Patalliro is the story of the young boy king, Patalliro, and his many misadventures as he avoids being assassinated by various beautiful boys with the help of his bodyguard, Major Jack Bancoran, of England's Information Bureau. Later they're joined by the hot-blooded Maraich, who has fallen madly in love with Jack.