Konakai Futaba loves her older sister more than anything else in the world. Kind, beautiful and intelligent, Ichina was everything that Futaba wished that she could be... she even encouraged Futaba when she was feeling down. As such, Futaba went to the same highschool as Ichina, hoping to be reunited after two whole years of being apart, but sadly Ichina has completely changed from the sweet, gentle sister that Futaba remembers.

A story about an ordinary boy named Mekh, whose life is about to change the moment he accidentally hit the infamous and easily-misuderstood girl named Saran.

This is the legendary Go Nagai's breakthrough work. Harenchi Gakuen is an elementary school whose teachers and students are all perverts. Boys peep girls changing. Girls pull up their skirts and show off their panties. Actually, it's not as evil as you imagine. They're like cubs playing together. It's only pre-school eroticism, nothing sexual. In spite of that, Harenchi Gakuen became a sensation. Parents, teachers, and politicians hysterically attacked the comic's immorality.

Hana Tabata is a lonely and unpopular high school girl with negative thoughts. Early morning in the classroom when she was pretending to be a manga heroine, the class's good-looking Yosuke accidentally saw her...!? This love, you will definitely want to support it! Masochistic system unpopular girl comedy!

From Shoujo Sense:

Pinch server Shimodaira Kanna enters high school with the hopes of appearing regularly in volleyball matches even though he sucks at everything aside from serving. The club he enters has three other formidable first years. But that's not all, even the older members look like a strong team. Will he get his chance to shine?

The story centers on an ordinary high school boy named Keita Amano. His hobby is video games, but apart from that, he has no conspicuous traits, and has never been in love. As Keita continues his gaming life, he suddenly becomes involved with Tendou Karen, the most beautiful girl at school and the president of the school's video game club. She shocks Keita when she asks him to join the video game club.

Watch how their relationship evolves and becomes more complicated, especially when other gamers come into the picture, creating all sorts of misunderstandings and drama.

One day, suddenly, an angel came descending from the sky!?
While heading towards his university entrance ceremony, Yuu meets an unsociable, mysterious girl. Yuu, who can't help but be curious of her — who is as free-willing as a stray cat — gradually shortens the distance between them. As various feelings mix around, their bond gets spun together, but what can be seen beyond that is…

Monsters have long threatened humanity’s existence. To fight against these beings, Keith, the youngest person to ever become a sage, joins a knight order and shows immense success on the battlefield. However, that doesn’t last long, as a quarrel with an incompetent higher-up gets him fired from the order. With nowhere to go, Keith is assigned as a teacher, and with his talent for bringing out the best in his students, his class is about to reach unbelievable heights...

Na Kang Lim, a high school student who enjoys reading webtoons, experiences a strange event one day when the female lead from his favorite webtoon appears before him. Even more surprising, the same incidents that put her in danger in the webtoon start happening in real life. The problem is, there's no protagonist in the real world to save her! Ultimately, Na Kang Lim takes on the role of the protagonist, looping through time to save her.

After being in a middle school full of Yankees and being humiliated by them all the time, Momose decides to change her appearance when entering high school; however, her clumsiness keeps getting the best of her, so she struggles to fit in. All she wants is to get away from the bad guys and it seems like she finally found a club to belong to, but the only other member of this club is not quite what he seems...

From Intercross
Waka is a 13-year-old Go lover! Learning from her grandfather, a pro Go player, she comes to enjoy connecting with the people around her, regardless of age or gender. One day, she meets the young genius go player, Sagisaka Souji, in a match that tore at both body and soul, and so she decides to become a pro go player herself!

"Now that I'm back, I won't allow my loved ones to die again!"

The Shadow Labyrinth - the most catastrophic existence humanity has faced in history.
Desir Arman is one of the six remaining survivors of mankind within it.

The six attempt to clear the final level of the labyrinth but ultimately fail, and the world comes to an end.

However - when Desir thought he would meet his demise, what is revealed before him is the world... thirteen years ago?!

Desir is returned to the past, back to the time when he enrolled at the nation's finest magic academy - Havrion. He is reunited with his precious friends, and is prepared to change the past to save the world and his loved ones...!

Three years remaining before the emergence of the Shadow World!
Change the past and gather powerful comrades to save mankind!

The conflicts and fights over daily trifles have never ceased between this pair of interesting siblings, the cool little sister "Secondra" and her funny elder brother "Minuto", but as long as one of them is in need of help, the other will never stand aside and do nothing. What a weird match! Now let's have a look at their friends. Joy Zhen, the old chum of Minuto, is a handsome boy with simple mind. Grace, the best friend of Secondra, is a warm-hearted girl who mistakenly regards Minuto as a bad boy. So here starts our story...

Yuna is serious and reliable, what will happen when she meets the mature yet slightly airheaded Biyori…?

Meirin, a junior high schooler, is the real identity of the famous "Dr. Rin" who heads a very popular feng sui website. She is in love with her best friend Asuka, a member of the soccer team. "Dr. Rin"'s advice has granted success for many, yet Meirin's own love life doesn't seem to be going too smoothly?

An earlier work by the mangaka of the popular "Beauty Pop"!

Han Jee-Han, a normal high school student, suddenly develops a special power where his entire world is shifted into a game-like setting. He can see the power levels of people, look at the stats of a seemingly normal item, get abilities, and even level up! Follow Han Jee-Han as he discovers how to use this power, and maybe even where it came from.

Description from Line Webtoon:
What if your life is just like playing a game? What if you can upgrade your status and gain more levels? A fantasy world is coming right at you!

From Chibi Manga:

Four companions are living in the same mansion. They're sharing the same school, their family, their future but also… love stories. But now, their journey to become adults is about to begin…

In the year 2008, high school girl Sakura Minamoto is abruptly killed in a traffic accident. Ten years later, Sakura, along with six "legendary" girls from various eras of Japan's history, are brought back as zombies by a man named Kotaro Tatsumi, who seeks to save the Saga prefecture by putting together an all-zombie idol group.

A boy communicates with the world through music... Yutaka, a boy soprano with an angelic voice, who is sensitive and perceptive and cries easily, decides to become a member of the choir when he enters junior high-school. This work portrays the harmony of the passing days of life at school, in which boys and girls share both their joys and conflicts. (via: Japan Media Arts Festival)

17th Japan Media Arts Festival Jury Selection (2013)

One day, high-school student Hanamoto is called out by a guy named Furuya, who's in a different class. At first he thinks that Furuya might be trying to confess to him, but it turns out that he just "wants to be friends." Hanamoto is nonplussed -- and perhaps a bit disappointed -- but agrees, and soon finds himself spending more and more time together with Furuya.

But what, really, is this innocent-looking boy's reason for brazenly seeking out Hanamoto's acquaintance?