This one-shot is contained in a book called 7 Ways to Become Absolutely Beautiful (Omoikkiri Kirei ni Naru 7 Nana -tsu no Houhou) (思いっきりキレイになる７つの方法).
Additional information about this book is as follows: No one will call you ugly again!; You'll become beautiful and score a fabulous love!!; Because this is a collection of super techniques to make you absolutely beautiful!
(Source: ShoujoMagic)

Platonic relationships are becoming rare today. This is a collection of "Flower Comics" love stories written by seven writers.
1) Secret Housemate (Naisho No Doukyonin) by SHIMAKI Ako
Sweet short story of a middle school boy in love with a high school girl. She is meticulous about wanting to know everything about the person she is dating. Her emotion conflict when she meets this middle school boy, who challenges her way of thinking about relationship. The author diligently places the character in a muddled, flustered, and distraught air of insecure emotions. She feels baffled because she can't comprehend why she likes him, even though she knows nothing about him.
(Also published in Iinazuke Ryokan)
(from M-U)

[From Shoujo Magic]:

This is a shoujo horror anthology, containing 9 stories.

1) I Know Basketgore
After loving Shouhei ever since her second year of middle school, Natsumi finally gets to go out with him.But then she starts getting prank calls telling her to break up with him.Then mysterious things start happening around her. Pots falling from windows, insects in her locker, glass shards in her towel. Are these just harmless pranks, or is someone truely out to get Natsumi?

2) Labyrinth Maze of Memories
"Forgive me!Don't kill me" Those are the words Honjou Kumi continues to hear in her nightmares.She lost all of her memories of the time before her accident, so she doesn't understand why the students stare at her and whisper.Pranks are pulled on her left and right.What is it that she doesn't remember?

3) Best Friend
Koyuki and Hiroyo are the best of friends.They've always chosen to be with each other.Hiroyo always listens to what Koyuki tells her to do, because she knows best.So when Kinoshita says that he's in love with Hiroyo, Koyuki doesn't believe him.She says the only way she will believe him is to go to the lecture room at 5:55pm to see the bleeding holy mother statue.Hiroyo tries to stop him, causing all three of them to see it.According to the rumor all the people who see the bleeding statue will all die.Things start happening, causing Hiroyo to be frightened.But only she is targeted.Could it be that Koyuki and Kinoshita are out to get her?

4) The Neighbor's Doll
Itsumi finds her neighbor, Yurika's, doll in the trash, so she decides to adopt it.She sets it out onto the balcony to dry and Yurika notices it there. She gets jealous because now it's all clean and cute.She gets her mother to get it back saying that it was thrown away by accident.After getting the dye on her shirt she says she only wanted it back so Itsumi couldn't have it.In the morning, the doll is sitting at Itsumi's door.However, Yurika claims she didn't put it there...

5) Black Cat
Sakura is a timid girl,unable to say no, so when she sees two classmates throwing rocks at a cat, she wants to stop them but can't.They tell her to join in or they'll tell everyone to ignore her.she throws a rock at the cat and runs away, hating herself for it.she goes back to check on the cat to find it dead from the rock she threw.An old lady tells her that the cat won't be able to rest in peace.Strange things start to happen around her, and the two other girls are dead, so will she end up dead too?

6) Former Residents of Darkness
Mihara Yuna and her family just moved into their new home.Not soon after she notices a figure standing in the doorway and she feels a cool gust of air,but the air conditioner isn't set up and it's the beginning of summer.Her father has started feeling unwell.She starts seeing the white shadow turning up in other places.And she hears voices saying to get out.Soon she hears from the real estate agent that the house is haunted that the whole family died in that house on the 29th of July.Any family that moved in died, and the day they moved in was July 28th.

7) Last Request
Mikoto and her childhood friend,Yamato are staying at her grandfather's temple which they use as a hostel.In Mikoto's room, she finds a doll.She is told that the doll is that of a dead child. She then prays for the child. She is woken up in the middle of the night by Ayano, the dead girl, asking for water.Then she continues to ask for more and more, gaining everything she wants.But then she wants Mikoto's life. Will she give it to Ayano?

8) If You Turn The Page
Emiri finds the notebook of her decease mother in her study, and decides to write horror in it.But then the events that she wrote about start happening around her.She knows she must stop writing in the notebook, but suddenly her arm is taken over and forcing her to write.People around her are starting to die, but how can she stop it?

9) Red String
Mayumi says that the red string tyed to her pinky is attached to her life long partner, Yuuya.And then, Yuuya is hit by a car at in intersection. But has the red string really been cut?

From Delish Scans:
On my way to school, I walk by you.

From Baka-Updates:
An anthology of short stories:
1) Hurt me Gracefully (Shinayaka ni Kizutsuite) by KITAGAWA Miyuki : this is the first chapter of Shinayaka ni Kizutsuite.
2) Devil Cat's Temptation by NAKAHARA Migiwa.
4) Takaya-kun of House Tanaka by SHIMAKI Ako.
6) Story of a Long, Long Night by YOSHINAGA Noriko.

A collection of 6 different works by popular mangaka.

This is a collection of stories written by eight popular horror manga artists.
1) Welcome to the World of the Picture-book by Arai Kiyoko
Yuri hates her life. A strange picture-book appears and Yuri envies the girl in the story...
2) I Want You Close by Oobayashi Miyuki
Riko can see ghosts. She decides to help a boy ghost in her classroom. But then she finds out who he is...
3) I See a Hen by Ono Eriko
Etsumi always takes advantage of Mika's kindness. They have to care for the school hen, Ko-ko. Careless Etsumi forgets to lock the cage...
4) Forest of Memory by Takamiya Satoru
Tomori Asabika awakens in a strangely empty house. Then a boy dressed in black appears at her front door and helps her awaken memories--memories she doesn't want to recall...
5) The Show-off Ghost by Kumazaki Shinko
Amiri Kazuke and her Mystery Research Committee are aided by girl ghost Mamoka. Latest case: a mysterious molester on a train. Their lead: a boy ghost wearing a green raincoat...
6) Message S.O.S. by Komuro Eiko
Miyuu Fujiwara is excited with Ai, her new pen-friend. Ai is smart and caring. When she mets a guy that she dumped, Ai tells her to not go on the date, but Miyuu says that it will be alright. Later Miyuu finds out that she is being stalked. Will Ai be able to help her?
7) Me Inside the Mirror by Kagari Junko
Saitou has no friends. One day she passes by a mirror shop and the owner asks her if she wants a mirror. She says that she hates them since she always looks gloomy, but the owner tells her that he has what she needs.
8) Doll Shop by Yamada Sakura
Meg wants to look beautiful like the other girls in her class. One day she passes by the park and mets a beautiful girl, who tells her that they should both go to the "Doll Shop"
(B-U)

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!!!