Rin Hashiba lives together with her grandpa. One fateful day, while offering a prayer to God at the temple, a demon named Char appears before her. Seeking the blood of a virgin, Char is lewd, mean, and quite full of himself. He may act high and mighty, but in reality, he's very loving and kind. Even though she knows it's forbidden, Rin's body and mind are bound to fall into the demon's clutches one day...

from Renta!

The inexorable girl who aims to be a champion; Jain! and the innocent boy who loves her, Tae jin! Their challenges on the road to championship and an unfitting summer-like love story. -from Naver Webtoons Please address this work as a Manhwa (Korean word for cartoons)

Mu Qian Ran, a sixteen year old girl, who had always set her heart onto studying the art of Chinese medicine, is excited as she has been accepted into her first choice of college, Yan Huang Advance technical school! At the same time, due to a mysterious portrait of a girl that no one could tell when was it drawn, Qian Ran is able to see illusions of fire. She ignores the incident, but this would start the unraveling of a great secret.

Paraizo is a 4-koma manga filled with sex jokes by Dowman Sayman, an artist with roots in the doujin scene of Japan.

Salome moves around a lot with her mother. She's learned not to get too close to anyone at each new school, or to let them find out her secret: she's a witch! When the sunny Hikari tries to make friends with her, Salome thinks she's just being nice out of obligation, so she decides to find out what Hikari really thinks of her...

As a baby Jiro was delivered to his foster parents by a massive oni, who said he would return for Jiro in 15 years. When the time comes Jiro must contend with enemy oni, dark cultists, and their minions while attempting to protect both his parents and girlfriend from their depredations. Ultimately he must embark on a journey through the past, future, and other dimensions to embrace his destiny as Shuten Doji reborn.

From StarryHeaven:
The story about a girl named Tenko who plays basketball. She has a boy (who also plays basketball) whom she has a crush on. One day she encounters a demon, with the shape of a fox. This fox-demon now possesses her body as he looks for his missing tail. As he searches for his tail in Tenko's body, the fox helps Tenko become closer to the one she loves, with magical tricks.

First story. The student is a 17 year-old girl named FUJIWARA Kayo. She loves games. She is always playing her handheld (It looks a lot like a PSP) in class. One day, her teacher, a handsome, but kind of mean-looking guy named HAIBARA-sensei, catches her playing it in class, yells at her, and confiscates it. Grr, stupid Haibara-sensei, always ruining her fun! Kayo can’t stand him, and doesn’t understand why he is so popular with all the other girls at school. Ah, but Kayo is in for a surprise!

The second story. It’s about a shy girl named ICHII Ekko who has a great imagination and a talent for drawing. Every day at school she fills her lined notebook with drawings, complete manga stories, about the people around her. She can turn any minor interaction into a silly shoujo manga plot, complete with sparkles and flowers, and a heroine that looks just like herself. Her notebook is her secret, and it would be horribly embarrassing if anyone found out about it...

Story 3. High school girl Naomi is excited to learn there is a new boy transferring into their class. Until this year, her school was a girl’s school, and even though it’s now co-ed, biys are scarce. So a new boy at school is big news! Unfortunately for Nao, the transfer student isn’t exactly a nice guy. His name is Katsuyuki-kun, and he’s tall and scary looking. He has an aura around him that just screams ‘do not touch! go away!’ He is like a feral cat or some other wild animal. But in spite of this, Nao doesn’t give in. She can tell something isn’t right. Will she be able to make friends with him?

Story 4 is about a guy and girl who are already a couple. Rinako really likes Shun, but he doesn’t seem to want to take their relationship seriously. Even though he know it makes her mad, he is always going out with other girls. When Rinako confronts him angrily, he apologizes, but that doesn’t stop him from doing the same thing over again. In fact, he is always playing tricks on her and doing little things to bother her. But will she still take him back when he goes a step too far?

Finally, the last story is a brief and funny tale of friendship, jealousy, and romance, with a bit of basketball thrown in.

A Kiss, Love, and a Prince" takes place in the same setting as "Even if We're Not Friends," but centers around different characters. The main character is kissed by her sempai, who is playing opposite her in the school play, and freaks out because she always imagined her first kiss would be with a boy, preferably a dashing prince. -- Lililicious

Two stories:

The Moon and the Lake
Kazuna's late grandfather was a writer, and his unpublished novel depicting his private life was found among the articles left by him. He had written down his affection to his lover, while he was a devoted husband. Kazuna felt perplexed, and went to see his grandfather's lover.

Nora in December
Does anyone know where "Nacchan" is? December, ten years ago, Nacchan's house next door burned down. Both parents were safe. Only Nacchan was never found. The body was never found... In the chaos of the fire, only Nacchan... disappeared.

From StarryHeaven:

Maria is a girl attending a Christian private school. Her mother is sick and in the hospital, her family poor. They live off the money of a man whose identity is unknown to Maria. He is called “Daddy Long-Legs” and he supports Maria and her mother with only one fee: Maria becoming his bride. Just who is this mysterious man? Is it the doctor? Someone she does not know? A boy from school…?

B&W oneshot about an awkward couple.

From Chibi Manga:

what is the taste of love? is it extraordinary sweet? Or....
is love really sweet? Or does it become sweet because of many many fights?

Yuna never wanted to talk to the handsome boys of the neighbor high school. And then she was confessed by the most beautiful of them, she can't believe it. does he just tease her...? Can she believe in this love...??

From Intercross:

1) Oikaketemo Chikazuitemo
When she was small, Uiko exchanged a promise with childish Mako that when they are high school students, if they become a couple, they will kiss. All this time, she hasn't been able to forget that promise. But now that they've become high school students, Mako is a popular guy in her class, and Uiko is a plain girl without any redeeming points. No matter what she does, she can't be honest to Mako, who already belonged to a different world before anyone knows, but...?

2) Santa Claus wo Dakishimete

3) 1000% Aisuru Kimochi

4) Suki Sugi Chatte Gomen ne
Chikage has been dating Manato for 3 months, they've held hands, and kissed too and now finally Manato has asked Chikage over. Even though Chikage has mentally perpared herself, can she really take that important next step?

5) Aishi Kimi wo Dakishimete

From Lovers Dream:

It's about a girl who falls in love with her little brother. She thinks it's bad, but the two of them learn that they are not related by blood.

Mei and Takeru are twins who have a very close, if slightly flirty, relationship, and are quite popular within the school. Their relationship is both a source of amusement and dismay to both the male and female school population, especially with Mei, whose massive brother complex keeps her oblivious to serious confessions from other males. Their relationship becomes even more complicated, however, when the two of them learn that they are not related by blood.

Otokogi power!

Moving into a boarding school for the first time Sakurashima Minato accidentally goes to the wrong building and encounters a strange man in a white coat, who calls him a martian and offers to help him take over the world. Minato's not very bright so he could be in alot of trouble here...

Little Busters! revolves around Riki Naoe, a young male high school student. When Riki was a child, his parents died, leaving him hopeless and depressed. What saved him was a group of his friends who referred to themselves as the Little Busters; they took Riki out and played together with him during his time of need. He really enjoyed playing with them, and his grief gradually faded away. When the story begins, they are in their second year of the high school they attend. They still hang out together, and enjoy their school life.

From Del Rey:
Yamato is ready for a fresh start. So when his aunt invites him to stay rent-free in her big-city boarding house in hustling, bustling Tokyo, Yamato jumps at the chance. There's just one teensy-weensy catch: It's an all-girl housing complex and spa! Things get even more nerve-racking when Yamato meets his neighbor Suzuka, a beautiful track-and-field star. She's not just the cutest girl Yamato's ever met, she's also the coolest, the smartest, and the most intimidating. Can an ordinary guy like Yamato ever hope to win over a girl like Suzuka?

The second shounen-ai manga ever published, The November Gymnasium focuses on chaste, yearning love between boys at a prestigious German boys' school.