“If my true heart leaks, I wonder what feelings I will convey...” In this world, if your dissatisfaction rate reaches a certain level, your "Split" will satisfy your desire for you; Fission Syndrome. Makoto, a first-year high school student who fears Splitting and confessing to his crush, was accustomed to keeping his feelings hidden… Until, one day, in front of Makoto's eyes, his crush develops Fission Syndrome?! Moreover, it was a terrible Split that appeared... Received a grand prize at the 3rd Manga Box Editorial Club. "I can't hide my thoughts in this world," the Split Love manga is finally published!

The unlucky male protagonist accidentally joins the fairy chat group, and an extraordinary student life starts like this

One day, your average joe university student, Kashiwagi Yuuya was summoned to another world by a stupid goddess. His mission is to do what any cliche Isekai MC does; become the hero, get the harem, defeat the demon lords, save the kingdom/other earth and go back to earth. After doing all those menial shit, he was granted to go back to his original world with only a second passed despite wasting 3 years in his "hero" life. Expecting himself to be an average joe again, much to his surprise, he still retains his powers as a hero. It seems his mission is just not over yet. It's an isekai but not an isekai but technically an isekai? Just read it to find out! From the popular web novel is now in manga form! WN Raw:

I was judged by Lord Yama in hell because I gave a hasty bad ending to my novel he loves and stopped updating it. As a result, I was sent to the world of my novel as a villain and the matrilocal husband of the infanta. However, the life of going against the original protagonist and encountering girls is actually not that bad..

Oliver, an adventurer almost in his 40's received a certain mission in regard of his earnest personality. That mission is to bind a contact with fellow deredere little in spirits who have great power or something like that!? Thus, the fellow spirits gathered and the new life of Oliver as school principal begins--!! - Summary from Gardo Comics

A world where wars are fought with spies. With a mission success rate of 100%, the remarkable, yet rather difficult to deal with, spy Klaus is being tasked with an almost impossible mission by the agency, harboring an insane 90% chance of failure and death…which for some reason involves eight inexperienced girls?!

Wang Tian, ​​who works in the martial arts hall, found a bug when he registered on a live broadcast platform after being expelled. Using the rewards in the live broadcast room, he opened the treasure chest to get cheats and swept those who once looked down on him! Martial arts, food, art, wealth! Wang Tian has everything!

Genius learns to go through different worlds and become waste materials? Use the draw card to open the back road of Xueba’s harem!

There is a world where there is no end to those who seek spirits and those who hunt spirits. In this world, there was a baby who was abandoned by his real parents as a detester to black hair and black eyes. The name of this child is Wilm. Picked up by the spirits, he grew into a summoner who protects his beloved sisters and the beloved village. "I won't tolerate the guy who dares to touch my family!" The blunt and summoned beast sisters shake the world. An exhilarating summoning battle fantasy begins now!

Alien technology, human martial arts, collision and confrontation of two worlds. The pinnacle of the strong, the alien fiasco, reborn high school era! In this life, Tang Ming decided to rise strongly and protect the world. Past goddess, genius girl, sexy teacher, long-legged elder sister, foreign princess are all under her command; thirteen martial arts, religious forces, hidden strong, strong who follow me, and those who are against us are all beating! In the heyday of monasticism, I am invincible!

I, Takayama Aruto was summoned again in replay mode, keeping all of my past stats. This time, a large Hero’s Summoning was conducted which brought along the whole class. Sick of doing the job of a Hero, I hid my stats from the others and chose to become a merchant. But, I must have hidden my stats so well that our summoner thought I was trash and was casted aside. So, I decided to form a party with the three beauties in my class who were similarly thought to be useless (a Tsundere, a lolita and a meek girl)! But, it’s okay. I still have my Item Box and Item Shop. I’ll just have to make whatever it is I need! And so, I led a relaxed life in another world creating items DIY and hawking, but…… The Dragon Demon Lord and my past wife, a succubus comes knocking on my doorstep and seeking love. It seems that the transmigration this time is going to be troublesome yet again! ------------------------ TL;DR Version: OP Harem Isekai Protag gets Isekai'd again (with his entire class this time), hides double OP abilities for slow-life living, starts new harem with girls from the class and the harem from the first otherworld that followed him to this one.

On the day of the wedding, he was swept out by his wife and returned to his residence, but he was frantically asked for a kiss by a glamorous stranger. The moment his lips touched, he felt a torrent of water rushing into his body. When he woke up again, There are more than ten thousand strangers’ memories in my mind…

Shinohana Mayu and Aoba Souma are childhood friends and enrolled in the same high school. There's energetic Mayu surrounded by her classmates with their unique personalities and Souma who always looks out for her. Join in their daily lives in this hybrid childhood friend-school life comedy! (Source: MAL)

“Warning: Mature content: This manga contains materials that might not be suitable to children under 17. By proceeding, you are confirming that you are 17 or older.”Zhang Muji who only wanted to buy his muse a gift by doing a part-time job ended up facing a weird gate. His greed angered the tycoon on the other side of the gate, and was punished for another part-time job. Zhang Muji was very reluctant. What’s the difference between a part-timer without pay and a loser! Zhang Muji had an idea to get rich by charging a “Gate Construction Fee” from all the immortals…

Updating

Destiny brings Bi Ningxi back to her high school. This time, she decides to show her best of herself to those people, making a great comeback through the domination of her own youth.

Having become overwhelming strong, a mage was bored with his life and decided to reincarnate in another era about 1000 years later. But after reincarnation, the mage now known as Kurt saw a world where magic had declined, and the mages of the era are overall much weaker than those of 1000 years ago. It also seems that Kurt is being looked down upon for his "Gold Magic" as it is called "Defective Magic Power" in this era. In order to investigate the mysterious decline of magic in this era, Kurt enrolled in the Magic Academy at the Royal Capital and showed his extraordinary talent where he would become unparalleled in this second life of his too!?

Long ago, Chien Han underwent "forced cultivation" because of the domineering empress. He cut off part of his soul to escape from the tiger's den! After that he is reborn in a new body. In this life, he will study military affairs and master spiritual practices.

Chrome was a magician in the hero’s party. He fought the Demon Lord’s army alongside people like Irina, the lover who vowed to marry him in the future, and the hero, Yuno, who was his close friend. They were all close companions. However, that was only in Chrome’s mind. His lover, Irina, became intimate with the hero, Yuno, and Chrome was sacrificed to make the hero stronger. Chrome’s magic powers were snatched away and he was kicked out of the party. Demons surrounded him as he was on the verge of death and he was driven to a corner. At that moment, Chrome awakened to a “darkness” within himself. Amidst his despair, he acquired an unrivaled skill. Now with this skill, he could exact revenge.

Updating

Former black company employee, Jiro Tanaka leaves his job due to overwork. In his home, he founds a job recruitment template which is from another world company. The job is to test the dungeon created by the demon king. There, the days of diving into the dungeon as a "dungeon tester" were waiting for him to complete the dungeon that even the hero would not be able to clear. He has a hot dark elf boss who has an amazing ability "Magic resistance". The New life of our MC starts! by: Socialweebs

I woke up in a strange bed, with not just one, but two lovers beside me! In this game of love, affection, and deception, I’m Elvia, the Imperial Princess, with a gaggle of men vying for my favor. Sounds great, right? Except this means I'm also stuck as the villainess while the main character is my manipulative maid, Arielle! She’s out to bring me down, and she’s got plans for my harem of men. But I know all her secrets, because I can see her player notifications. Can I beat her at her own game?

Yang Ming is the epitome of delinquency; getting in fights, skipping school, and cheating on tests. One day, he gets a mysterious pair of contact lenses that changes his entire life.

An average romcom told from the perspective of the losing childhood friend.  Other things happen as well.