From Delish Scans:

"I'll be your captive."
Love potions DO exist.

Yuuma is taciturn and no one knows what she’s thinking. But then, she’ll meet someone that will change that…

This is Masashi Kishimoto's manga, Karakuri. It was created before Naruto and was collected in Naruto: The Official Premium Fanbook.

In order to combat a deadly virus, an implant was made that is transplanted into a human being's nervous system. Unfortunately, this implant technology was also used by the less scrupulous to create human weapons, blood-red eyed creatures referred to as "Roido". To cope with this threat the defense agency has created the Karakuri unit, an elite unit whose human members are monitored by small talking animals. As Kiru the karakuri goes to visit his friends Koten and Koron while on leave, he's going to learn that there are no days off against the Roido!

Collection of Oneshots:

1) Hanjuku Hime (Rookie Princess)!

2) Oresama, Kaimasen ka?!

3) Kiss Friend
Emimi had had several boyfriends. However, she disliked any intimate contact with them. Whether kissing or even holding hands, she got disgusted and simply breaks away. One day, she realized that her long time friend, Shinji, did not gross her out and asked him to kiss her. That, of course, is the beginning of a romance.

4) Imakoi

5) Kaori-chan Himitsu Nikki
Kaori has quite the imagination when it comes to romance. In particular, she daydreams about cliche school romance scenes between herself and the boy she likes, Ryuu. One day she drops her diary and it’s picked up by the difficult and hard-to-approach Mayuki. Is this the beginning of a beautiful friendship, or fandom?

A story about two friends flirting in the summer heat.

Gomennasai.
A student hooks up with a woman for casual sex. They have an awkward meeting sometime afterward, in his classroom... because she's a substitute teacher.

Bousou Kiss

"...Gokko"
Brother and sister. A couple plays an incestuous game where they do perverted things to each other until one gives up.

Otoshigoro

One Step

Ferris Wheel
Sudo-san has a lover, who is two years younger than her, Takahana-kun. After receiving the news that Takahana-kun is going to be transferred, she thinks about how to work out their relationship.

Yume Musubi to

Hakuchu Yamu

Yoshi x Yoshi

Only One
Izumi Taeko is a weird and flighty girl, rumor has it you'll only need a coin to get your way with her, but is this true?

- Animexis

Reset

From Chibi Manga:

Hachiko is in love with her childhood friend. but he's now a popular idol...

After being abandoned by first her father then her mother, Yuu has become a girl who refuses to get close to anyone. There is one girl, however, who won't leave Yuu alone. The energetic, popular Ayumu inexplicably can't resist approaching Yuu at every opportunity. Will Ayumu be able to break down the walls that Yuu has created around herself?

One-shot webcomic involving a girl, a train, and another person.

Yuu thought that love and romance were meaningless things... That is until she finds herself cross-dressing just to get a date with a cute girl. Can she keep up with her charade?

From Chibi Manga:

She was her best friend and he was her first love...she didn't plan to change that. Ayu and Kaho were friends since kindergarten. They were the exact opposite; and even if both them were cute, they hated men. But one day, Kaho found someone she loved. "why? I was the one in your heart before..."
"Let's play at football" said a boy that Ayu never saw before. But, she felt her heart beating so fast and hurting so hard. It was the beginning of her first love...

Includes oneshots:
...Suki
It happened by accident... my first kiss, with Naohara-kun... 6 years passed, but that awkward feeling didn't go away.

Zutto Zutto Daisuki (I Will Forever Love You)
In the winter of my second year of high school, I had an unforgettable love. I really, really like you very much...but at that time I couldn't protect you. I'm sorry Ema.

From Chibi Manga:

Asuka, the ace of the volleyball club is training to become the best. But there's the devil coach, Nagano...

Kaname gets the shock of his life when a beautiful person confesses to him in the middle of the street. He falls at first sight, only noticing later that it was a BOY!

From Delish Scans:

On my way to school, I walk by you.

A collection of oneshots:

1) A kindly shoemaker becomes the Earth Princess' exclusive shoemaker.
- Omari's Sister

Ooishi has never had a crush on anyone, believing it was easier not to love. Until the moment she meets Mizuho, a self-proclaimed "Mermaid" who's love will never be returned.

"The last question was asked for the first time, half in jest, on May 21, 2061, at a time when humanity first stepped into the light. The question came about as a result of a five dollar bet over highballs, and it happened this way..."
—Opening line, The Last Question

The Last Question is a science fiction short story written by Isaac Asimov in 1956. The story deals with the development of computers (artificial intelligence) called Multivacs and their relationships with humanity through the courses of seven historic settings, beginning in 2061.

A personal favourite of the master Sci-Fi writer Isaac Asimov, it is a thought-provoking fiction that even most non Sci-Fi buffs can enjoy. And this timeless classic has been adapted into webtoon format by Ryul, an active illustrator in Ruliweb, which is a Korean web community for subculture fans.

Orginal webtoon

From Chibi Manga:

The guy I like is an awkward person. Someone who isn't very honest towards the girl he likes… ♥