Oono Chiharu and Kawahara Asami used to be a couple during their high-school years. When Chiharu suddenly moves away without a word, Asami is left with nothing but a broken heart and memories of first love that aren't quite so easily forgotten.

Seven years later the two meet again as career women; Asami recognizes Chiharu immediately, but the latter gives no indication that they've ever even met before. Furious and feeling as though she were betrayed all over again, Asami vows to give Chiharu a taste of her own medicine...

Sapphism no Gensou is based on the game of the same name.

In response to signs of an impending invasion by alien conquerors, five young people have undergone modification surgery in order to gain the strength to fight them off when they arrive. There's been no sign of them since the initial warning message ten years ago. The hero of justice Serena and her teammate/lackey/punching bag Souya have been using their powers to protect the weak and destroy evil wherever it looms its head. But with the sudden return of their childhood friend, things are in for a change.

From Okazu:

Hayase has gone to this school for years, so she knows that you do *not* touch anyone on Monday, and if you do, there's a little incantation that must be recited. But Mashiro has just transfered in, and does not know these things. Hayase explains that we do not touch on Monday, because not too long ago two girls did - and they fell in love, became lovers and tried to die together. Therefore, if you don't recite the charm, you might fall in love with whomever touched you...and that would be bad. Of course Hayase explains this after Mashiro has touched her...on a Monday.

Aoki Ume's C77 doujinshi, one original story about a high school couple and a GL one about Yumi and Momoko from Saki.

Himoto Sora is a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Gakuen, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused she steps in and through some sort of error unwittingly becomes the first female participant of the game.

Republished in 2017 in a 3 volume omnibus
1) Shitsurakuen - Hangyaku no Otome no Shou
2) Shitsurakuen - Shinai no Otome no Shou
3) Shitsurakuen - Rakuen no Otome no Shou

A collection of one-shots:

• Sleeping Beauty no Mita Yume (Sleeping Beauty's Dream)
Tsukasa gets a kiss from the girl she likes, but she's not happy about it.

• Hakushi (Blank)
The protagonist loses some of her memories and can't remember a girl who was very important to her.

• A Witch's Hand
It's about psychological manipulation.

• 20, 21
Fuji doesn't see her friend Asagao in a romantic light, but Asagao is hoping to change that.

• Hakushi, Continued (Blank, Continued)
Retells the events of "Blank" from Takako's perspective.

• Twelve-Year Age Gap, Six-and-a-Half-Mat Room
About the relationship between a schoolgirl and a twentysomething recluse.

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Oneshot about a confession that makes things awkward.

Short stories of romance between girls who strive to improve on their magic in an academy.

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From Lililicious:

In "Sweet Lovin' Baby," a girl meets a lesbian couple in a bookstore one day. They become fast friends, and she develops feelings for them. But little does she know that they have their own problems to worry about...
The title comes from a Laura Nyro song. You can listen to it on her CD New York Tendaberry. Lyrics to the song are included in the zip file.

In "Rain Was Falling," two young women meet on a rainy day.

As you might guess from the title, "Doomed Love" is about unrequited love.

In "Miyuki," the protagonist watches another girl from afar.

[From Lililicious]: Swear is a very short one-shot based on the video game Akai Ito (Red Thread).