1. Houkago Wedding (After School Wedding) by SHINJO Mayu
Hana is a jealous wife, and Ryuki is her hot-shot-model husband. The thing is, he's also her teacher at her high school!! Both struggle to manage their love and life while keeping their relationship a secret from the rest of the school.

2. Platinum Talk by ENOMOTO Tsubaki

3. Close Distance Love by YAMADA Komomo

4. Until I Fall in Love by YUMACHI Shin

5. In Love for 10 Years by OSAKABE Mashin

Suzuki Sora is a cheerful country girl from the small town of Bie. She made a promise to her father, and following this promise applies and is accepted for a magic intership in Tokyo, where she will face the life in a big city. While training to get better with her magic, she meets a mysterious boy also practicing to become a mage. While he can not use magic that well and he seems distant and cold at first, Sora's fate intertwines with his and the two are thrown together, learning a lot of new things about life and each other. (source "Wikipedia")

It was supposed to be just a regular daily bus drive to their high school for Watanabe Sheena and her friend Yuk, but when the bus enters a thick fog, the unexpected happens and the bus gets transported to another world that seems prehistoric. With the bus driver gone, the only other passengers on the bus in this mysterious world are all high school girls: Izumi, Ayu, Kyoka, Anna and Jessica. With no cell phone or internet signal, they are completely cutoff from their world. To make things worse, they see hundreds of glowing eyes of predators at night waiting for the girls to make a mistake. How will seven high school girls survive in this treacherous place and get back safely to the real world.
(Source: MangaHelpers)

Asatte no Houkou follows the lives of Karada Iokawa, a young girl who is set to join junior high school after summer is over, and Shōko Nogami, a young woman who has just returned from studying abroad, who also happens to be the former girlfriend of Karada’s older brother.
The day Shōko returns, she is dragged by Karada to the beach with her brother and a couple of their friends since she used to know Karada’s brother Hiro several years before. After becoming irritated with Hiro for leaving her alone in the United States, she purposefully tells Karada that her ribbons are childish. This upset her greatly because she doesn’t like to be treated as a child.
Later that same day, Karada is found by Shōko praying at a shrine, wishing to become older. Amazingly, Karada’s wish becomes true and she instantly transforms into a young woman. Incidentally, Shōko then has her adulthood taken away from her and she reverts back to about eleven years old.
(Source: Wikipedia)

Cheese! Anthology with one-shots from various mangakas:

KITAGAWA Miyuki - Hoshi sae mo Nemuru Yoru
SHIMAKI Ako - No Panties Musume : first extra from volume 2 of Boku ni Natta Watashi

KASUGA Akane - Tomodachi Shikkaku: Riku is the prince of the school. Cute, kind, athletic...a perfect prince. If only she wasn't a girl!!!! On top of that she gets hassled by Sugisaki for grabbing the attention of the school's female body. Loved by girls as a prince and hated by guys..will she ever find love? (Note* NO YURI)

YUMACHI Shin- Koi no Neiro: Chizu is an innocent little high school girl. She's living life as a normal girl and is happy. There is only one problem. The boy she FEARS MOST is in her same class!! He's always so mean to her for no reason at all? Is it hate? Or...?

SAKURADA Hina - Yuuwaku Lesson Itashimasho

YAMADA Komomo- Platonic Porno: Yuna is the most popular girl in school. Girls worship her and ask her for love advice. Yuna always gives perfectly worded grown up advice. Boys are too timid to ask out such an expert in love and dare not approach her. But she's never had a boyfriend before!!! Everyone thinks she's VERY experienced, but she actually has 0 experience. Since she loves helping out others in their love lives she secretly reads ecchi books to give her inspiration. But what happens when she's caught? By the author of her ecchi novels himself!!!

Five creepy oneshots by five different authors. (Source: Mangaupdates)