An ever changing (and unusual) love triangle story, set in modern Japan.

[From Lililicious]:
Uchida is in love with Nakano, but feels like she can't tell him because she turned him down when he confessed his feelings to her years ago. One day, she sees him with another girl-- Kobayashi. The three begin spending time together, Uchida wondering all the while if Kobayashi is in love with Nakano and vice versa. It isn't until much later that she finds out the true object of Kobayashi's affections...

From Aerandria Scans:

Tomita Yuri has hated boys since she was little, seeing them as the devils who taunt and tease her. So when her all-girl school Kinka academy decides to merge with the Ginka academy for boys, her ‘heaven’ is once again threatened by the devils from hell = men. Not only that, but being a member of the student council, she now has to work alongside the male student council of Ginka academy. Will Yuri’s ‘heaven’ be overrun by the male devils from hell?

This is a manga adaptation of the Italian comic series of the same name.
Five girls find out they are the new guardians of the elements earth, fire, water, air and energy. Will Vandom, Irma Lair, Taranee Cook, Cornelia Hale and Hay Lin fight against the monsters from the parallel world called Metamoor and their evil prince Phobos.

She has looked up to her senpai on the basketball team for a long time. Now she finally makes her move as the biggest game of the season approaches.

The manga follows the life of Minagawa Nobara, a first year in high school. After having lived on the countryside her entire life she finally gets to go to the city for high school where she is reunited with Shuwa Ibuki. Minagawa met Ibuki five years ago at a party his grandfather had organized. There he had helped her when she was being bullied and the two of them became friends. Now, five years later Minagawa meets Ibuki again but doesn't feel like she had known the real him at all back them. Or did she?.....

Washizuka Shinichiro has just woken up after returning to Japan with his father the hard way, with a collar on his neck and his father gone, leaving a note that he’ll be back in 2-3 years and saying that he’s been left on the grounds of a prestigious school and he’s been enrolled. But before he can get there he has to find the school and use all of his survival skills to get through a high-tech environment gone awry, along with a female student he found sunbathing…

Love blooms at a Jurassic Academy.

From Chibi Manga:

Ten and Rio are friends from the old days. they will become high school students starting from this spring, Ten stills carries a certain memory in her heart....?

Contains Sekai wa Kirai de Afureteru

A comedy story about a schoolboy called Sam, and a girl who fancies him.Along with a cast of stereotypical, cliché characters, follow their adventures through an illogical manga world which breaks the 4th wall, and uses unoriginal outdated memes.

Haru, a boy who hates snow, is (for various reasons) transferred to a village which is surrounded by snow due to being also inhabited by yuki-onna.

Original webtoon (Korean webcomic)

Youhei immediately fell in love with the actor on the late night advertisement, Satomi. After going through some random events, they became lovers. However, how will these two love birds face the upcoming events which involves costumes, a manager, a stalker and maybe an old crush!?

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Guy Kim is busy.
Soo Ri Oh is busy.
So Ryong Rhee is busy.
Eun Rae Lee is busy.
Everyone is busy actually.
That's why we all have the right to romanticize.
Forever young.

Those that are tired of the busy life~ We provide the best romanticism you require!

The setting: A boys’ boarding school in Germany, sometime in the latter 20th Century. Fourteen year-old Thomas Werner falls from a lonely pedestrian overpass to his death immediately after sending a single, brief letter to a schoolmate:

To Juli, one last time
This is my love
This is the sound of my heart
Surely you must understand

A spinoff of main series Papa no Iukoto o Kikinasai!, this one is with Miu as the main focus of the story and her school life

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From A Duck's Paradise:

The prince of heaven is punished after defiling a thousand girls!

Meanwhile, a nine-tailed fox has always wanted to be human. She's waited a thousand years to have a flowery romance on earth. However, when she gets there--surrounded by manic obsessive school-girls, she realizes earth isn't what she's always dreamed of. Especially when there's a boy named "Cha Ga-Un" who ultimately gives heartache to all the girls he meets!