Our main char falls with a big bang for the new beautiful transfer student Natsuki. While he keeps it in himself, he finds out that Natsuki is quite the rebel who does what she wants, she’s strong enough to break his mean senpai’s arm and send him to the hospital, and she’s the one who just broke his bass guitar. He still follows her around and finds out that she’s quite nice but tries to distance herself from others. The reason is that she’s getting married as soon as she graduates. This is also the reason why no one really punishes her for doing the stuff she does in school. Still our main char falls more for her and it seems like the love is mutual? The hindrances in this story at the end of first chapter are the marriage and the mean senpai who falls for Natsuki after hearing her sing in an instrument shop.

From ShoujoMagic:
It's Ruri's 17th birthday today. And also the day that her relationship with Jyunya begins. However, was it destiny that their love is going to be a tragic one? What will happen to them now, with their parents against their relationship...!?

These are stories that deal with being an underage mother and how the characters dealt with the situation.

by Forbidden Garden:
a series of oneshots:

We are merely 17 years old and in love. And then I suddenly got pregnant, although he proposed to me straight away, my parents were against this, but I don't want to get an abortion, I want to be a mommy. No one can help us... which path is there for us to take?

Little Life Growing Inside - Falling in love, and then getting pregnant, is that a sin? Just because we're still in high school?

Spanning the Lost Life - Getting an abortion during the age of 15, and then being betrayed by the lover. I won't love anyone ever again, definitely...

I Will Become a Strong Mother - I'm a single mother, I have a crush on someone, is having this type of feeling a burden?

Believing the Feelings of Love

From Attractive Fascinante:

“It’s fine if our hearts aren’t connected”, that is what Takamura sensei thought when he confessed to his student, Rin. But after a few times of bodily contact, Takamura started to desire Rin’s heart. Will Rin open himself up and accept Takamura?

A collection of short oneshots: 1) 17 Sai Natsu Aki connfessed one year ago to Yoh, but he was going out with someone at the time. So, when she finds out they broke up; what she does might be good at first. But in the end will she be happy with Yoh? Or will something go horribly wrong? 2) 17 Sai Fuyu Yui loves Maki, (childhood friend), but does Maki love her? During winter break she goes to her aunt's (where Maki lives) and confesses her love. Does Maki love her too? Or is she going to end up with a broken heart? 3) 17 Sai Haru One sentence is all I've ever wanted to hear from her. That's all. I love her. But I can't, I'm not allowed. She's my brother's fiance. Even so, I'll do anything to make her mine. If I hurt her, bring her pain, well, as long as I can be with her. I don't care if she hates me. 4) 17 Sai Aki Nao is in love with her Sempai. His brother confesses to her, and she uses him to get to the guy she likes. Will it work? Will she get her beloved Sempai?

Saya is an ordinary, lethargic female high school student. While she was alone at karaoke, singing enthusiastically a song of her favorite artist, Takase Kazuki, the person himself was watching her…?!

A volume of 5 romantic oneshots.

1) 14R
Kawamura Tamaki, 14 years old.
Seen as a very serious class rep by everyone around. But, what does it mean to be serious? She too falls in love, and...!?
A blinding underworld unraveled here!!
- From ShoujoLove

2) Mahiru ni Kakedasu

3) Watakushi-sama

4) Koi wo Hajimeru Bokutachi ni (For Us Who Begin to Love)
A girl, Kawai Oto, and a guy... Will they fall in love?
- From Dragon Voice Project

5) Daily News
Two twins support each other through everything, but can a guy tear them apart?

From MangaHelpers:

On his seventeenth birthday, Amamiya Kota was going to ask his classmate Misora Hiyori out. Tragically, he dies in a car accident but is given a second chance back in the living world on borrowed time. He gets entered into a competition called the 13 Game where other people like Kota who were supposed to die return back to the world and given an option: locate and kill 13 other players or suffer the fate of death. Each player is assigned to a handler, mysterious beings with special powers, who use them as if they were characters in a video game. Kota’s handler, Merume, explains that there are players like him all over the country, each with a unique ability that helps them kill, and Kota has to kill 13 players within 1 year. With his demon hands ability that was inspired from his hobby of magic tricks, Kota must unwillingly participate in this cruel game if he wants to live. [vyc]

Satsuki Kakeru lost his sister by suicide and has been living a dull life ever since then. One day, he is transported into a bizarre world "Red Night" along with his friend Minase Yuka and six other classmates. In order to survive and escape from Red Night, they must defeat six black knights in order to return home.

From Heroines of Fantasia:
16-year-old Tsukimi Hina decides to get a part time job as a maid, and successfully passes her interview. One thing though: she can't use modern technology inside the house whatsoever?! Which means no vacuums, no cellphones, no laptops, etc. What is up with her twisted, but handsome, employer Asakura Shiyuusei-san? And what exactly is he hiding in his storage room...?

From Intercross:
16-year-old Hina's first job is with a 19th-century British enthusiast, Shuusei-san, as his maid. Even the way of cleaning has to be from the 19th century! Even so, this sweet gentleman makes Hina's heart beat so fast! There is actually another person in this residence, Mary Lou. She's as cute as a doll, but... she's, she's... a ghost?!

In this small town, within the 49 days after a person dies, you can see the dead's spirit. She once admired this small town where you can still spent time with the ones precious to you within these 49 days, but...

Includes two oneshots (not yet scanlated):
Soko ni Koi Ari (そこに恋あり)
Kimi wa Nanimo Hoshigarazu (君は何もほしがらず)

From ShoujoMagic:
1. 38°C
Taiji's normal body temperature is 38 degrees Celsius, or so he says, but Shiina thinks he's full of it. Taiji is a friend with whom Shiina can always--and does always--fight... Until Taiji unexpectedly confesses his love! Shiina begins to run a fever, but is that the only reason she's getting so hot...?

2. Solution Maze

3. Heaven in Jail

4. Winter's Aquarius

Collection of short stories:

• 37℃ Kissu
Naoki was a very cool and good looking guy, but somehow after meeting Fumika-chan, he's not cool at all, but very cute?!

• Himitsu no Namida (Secret Tears)
He saved his second button for her, but on their last day, she handed him a love letter to give to his best friend. Instead of delivering that letter, he kept it himself, and asked her to go out with him instead...?

• Caramel Kiss
Atsushi-sensei is Kawahara's first love, will he be able to accept her affections?

• Shounen Knife
Until Riki moved in, the house next door to Mimi's was always vacant. Riki saved Mimi's cat, but it seems that he isn't as well mannered as she first thought?

• Extra from Kiss, Zekkou, Kiss Bokura no Baai.

1-3) 37°C no Boyfriend
Wakaba got locked up in an elevator with a completely strange guy. Moreover, they happened to share a kiss. He's someone she'd never meet again... or so Wakaba thought, but it turned out that that guy, Chitose, is the boyfriend of Nao, her friend!
Nao introduced a surprised Wakaba to her upperclassman in her club, Takaomi, but no matter what, Wakaba can't forget about Chitose...
- Awakened Memories

4) Tsukiakari no Himitsu

5) Haru ni Naru Made Matte
(Also included in Houkago, Kimi to Koi o Shite.)

About a play-girl goddess from heaven who is stripped of all her 'goddess' powers and reborn as a human. The story progresses as her incarnated character learns to live, love and find what true happiness is all about.

From Noctis Op.92:
What exactly is the difference between a robot and a human?

In a dystopian future in which robots are becoming increasingly commonplace, a young boy named Hogu lives in near poverty with his grandmother and sister. Though he innately possesses a kind soul, he is ostracized by his classmates and frequently bullied. At the beginning of the story, we find Hogu, friendless and alone - until he meets a robot girl...and our story begins.

Thief Gintonic seeks the mysterious treasures known as "The Three Hearts". One night a mysterious woman falls from the sky claiming to be an escaped Princess from a sacked castle. As fate would have it, she has one of The Hearts. But is she really who she says she is? And will Gintonic let her live to fulfill her mission?

There’s one thing I understand when I became an adult.There’s nothing special about boyfriends, sex and kisses. but if I think that, will I be able to find love?

1-2) Can't Kiss for 24 Hours
A math teacher who has an intense relationship with the problem student, Kikusui Kiyoya. Even though they were a couple in love, one day, Sensei suddenly wants to break up...?

3) If I Didn't Have You
Fujisawa Yuu just moved to a new town. On the first day of school he's warned to stay away from Nanatsuki Haruki. The word around school is that Nanatsuki who is actually 20 years old will sleep with anyone, but only at school. The mystery is why he only sleeps with people at school and why hasn't he graduated yet?