Mirror is a parallel Earth where magic exists. Every object, every living creature (including ourselves) from our world has a magical counterpart in Mirror. The wall between both worlds has been breaking down and a mysterious force from Mirror has been sending out a psychic message luring people from Earth to the portals between our world and Mirror.

Haruto, son of a Minister. Mutsuki, daughter of a Shinto Priest, Kazumi, Son of a Buddhist Monk. Together these three make up the Holy Student Council of S East High! Join them as they help maintain the ghost activities of their school and work hard to better school life for everyone! Always there to lend a hand (or cause trouble) are the school spirits themselves from the gorgeous Toliet Hanako and Red Mantle to the adorable TekeTeke and Kagamiko-chan! Not to mention a new friend "Shingo Oomi!" who doesn't appear in the anime!

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From Seven Seas:

During a fateful visit to Tsunojo Girls' School, Chika Matsusato meets the girl of her dreams--cool upperclassman Haruna Kanzaki. Even though they spent only one short day together, Chika will never forget Haruna's kindness, and has made it her life's goal to study hard and get accepted into Tsunojo Girls' School so that they can be together. But will Haruna share Chika’s feelings...?

From Aerandria Scans:

Sakura dreams of the moon, a dream where she gets on a rocket, goes to the moon, and becomes the King there, with no one in her way. That’s why she doesn’t need someone to like… or so she thought, but recently, she’s a bit interested in Arai-kun, who sits next to her in class…?!

Nishina is doing well at his prestigious company but after divorcing from a loveless marriage, his success at work seems empty. A chance meeting at a cafe brings him into contact with the owner, Miyama, an old high-school classmate. It seems that Miyama has forgotten him until he asks Nishina why he's no longer wearing a wedding ring and what Nishina said to him 10 years ago in high school.

(Miyama also appears as a minor character in "After a Storm", set two years before the start of this series)

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From Yaoi Is Life:

Takamine's parents failed in their business, and everything was lost in no time. He is then left to live in a shabby apartment with Shirahane, his caretaker since childhood. Why did he stay, when Takamine is no longer his master, why is Takamine getting erect, and why does Shirahane think it's splendid?

In the Between the Sheets series:

V.1 - Between the Sheets

Ichise lost in somewhere he didn’t know then later found night bar that has amazing bartender, Takafumi. Ichise fall in love with Takafumi at first sight but Takafumi has his own rule that he will never go out with his customer. One day, Ichise tried to ask Takafumi out again and suddenly Takafumi says ‘yes’!?

V.2 - Blue Moon, Blue

Mamori Kusunoki's childhood friend Wakaba Kisaki has been dressing and acting as a girl for years, stemming from a promise to get married when they were kids.

From Fujoshi Spirit:

1-4) Hitomi no Dokusenyoku
The young model newcomer Shinpei moves into the house with several other male top models on his manager's order. There he meets Ryo, the most popular and seemingly flawless star of the group, who is supposed to watch over him. Shinpei's first thoughts are that he wants to become a great model just like Ryo, but then reality turns out to be very different when Ryo does nothing but treat him badly...

5-6) Mijuku no Dokusenyoku

7) extra - Sort of Normal Everyday Occurrences?

Kim Jumi's life is like that of any other teenager preparing for her CSAT's: all work and no play. But one summer day, she witnesses something on the rooftop of her school... From then on, she finds herself getting tangled up with two boys who are in a complicated relationship.

from fictiondb:

At his beck and call -- day and night!

Kane Lindley is a regular customer at the restaurant where Shannon works. When an incident results in her getting the sack, Kane comes to the rescue and offers her a job!

As well as being his secretary, Shannon also finds herself caring for his young daughter. In fact, he even persuades her to move into his home! But all the while Shannon is fighting her attraction to her boss, playing the part of a responsible, diligent employee -- until Kane propositions her, daring her to act on the overwhelming attraction between them....

Nine to Five

Komatsu Takeo doesn't believe in Santa. Then, while he was walking downtown, he picks up a round orb and it turns out Santa is a cute girl and she wants her reindeer's nose back! He returns it of course, he doesn't need it or anything, but Santa promises to grant him his wish, a girlfriend. If he chooses a girl by tomorrow, she'll make it mutual! This oneshot is a wild ride of rejection and new experiences.

In my neighbourhood, there's a gelato store called "Supernova". The facade is a little old and they serve gelatos of all colors. I always order vanilla. He always asks for a different flavour. Of this person, who always gives me flavored kisses, I... don't know his name.

1-3. Hitai ni Mikazuki
Ten years ago, Yutaka followed Azusa but ended up falling from a tree. Because of that, she has a moon shaped scar on her forehead. Then the two separated, but when he came back, he was a shinobi! (From ShoujoLove)

4. Gakuen Nanafushigi-kun (学園七不思議くん)

5. Kirakira Ichibanboshi (キラキラ一番星)

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A compilation of oneshots from Edo era.

A very short oneshot about taste, using the relationship between two women as a case study.

What is it that you desire? Money? Love? Walk again? Be stronger?

Whatever it is you wish for, you can get by asking the legendary and awe-inspiring "Demon's Plan"; a sacred object capable of granting anything to "the chosen ones."

Included one-shots:
Volume 1: Nigashi-ya
Volume 2: Brain Breaker