Collection of 7 short stories revolving around an all-girl's school.

From Lililicious:

1. Tomodachi ja Nakute mo (ともだちじゃなくても。, Even if We're Not Friends)
   "Even if We're not Friends," is about two girls who were friends in junior high but end up going to different high schools.

2. Tengoku ni Ichiban Chikai Natsu (天国に一番近い夏。, The Summer Closest to Heaven)
   Tells the story of a ghost who accidentally possesses a girl, then takes advantage of the situation to interact with the woman she loves.

3. Kiss to Koi to Ouji-sama (キスと恋と王子様, A Kiss, Love, and a Prince)
   Takes place in the same setting as "Even if We're Not Friends," but centers around different characters. The main character is kissed by her sempai, who is playing opposite her in the school play, and freaks out because she always imagined her first kiss would be with a boy, preferably a dashing prince.

4. Itsuka no Kono Koi (いつかのこのこい。, This Love From I Can't Remember When) Tells the story of one girl's unrequited love.

5. Kuchibiru ni Cherries (くちびるにチェリー, Cherries For Your Lips) Tells the story of a girl who's in love with her best friend.

6. Kusuriyubi ni Kiss Shitara (くすりゆびにキスしたら, If I Kiss Her Ring Finger)
   Nana wants to take things farther with Hitomi, but Hitomi doesn't seem interested. Meanwhile, Nana's failed her midterms, and she uses the make-up tests as an excuse to avoid Hitomi.

7. Honto no Kimochi. (ホントのキモチ。, Real Love)
   Michiru confesses her love to her sempai and asks her out.

Note: This is an omnibus-style series centered around the story of the main characters, Nana and Hitomi. The blurb on the comic describes it as the author’s foundational work in the yuri genre.

It was originally published in Yuri Shimai and Comic Yuri Hime, with the first volume released by Ichijinsha in 2006. Later, five new chapters were featured in Comic High! from Vol.78 to Vol.82, and in 2012, Futabasha re-released it as a revamped edition with two volumes coming out at the same time.