It's Shimizu Kanako's first day at an all girls high school, and she's a little overwhelmed. Hoping to make new friends, she bumps into the odd and distant Kamei Ao, as well as her first three new friends: Aki, Rikako and Haruna. Of course, not all can be so sweet in the world of girls.

2nd-year middle school student Ayumu Kurihara changes classes and is seated next to the beautiful but strange Misuzu Tsukishima who dislikes boys. Mizusu can't get close to other people, but after being moved by Ayumu's sweet, honest personality she begins to open up to her little by little. Ayumu too is captivated by the awkwardly delicate Mizusu and the two of them become close.
(Source: Taciturnity Scans)

From Intercross:

Yayoi is an energetic girl who is living happily with her single dad. All her life, she's always blamed herself for the death of her mom, and also she believes that her most important things always disappear on her birthday. This changes when a substitute teacher comes along...( story 1 doesnt actually have any romance!)

In this volume:
1) Sangatsu no Yume

2) Kitto Kagayakeru -
Because of some conditions with her body, Rei is always spending her school time in the school's infirmary, watching the various teams prepare for the school's Athletics Festival coming up. When sneaking out of the infirmary one day, she's found by one of the Cheer Group leaders, asking her to join their group! Rei intends to participate with all her power, without leaving any regrets behind...

3) Midori no Kakehashi
4) Harmony
5) Harukaze Fuku Shima

Stories in this volume:
• Kigi no Yukue
Juri has always been saying to herself that she has done everything that she wanted to do, and has lived to her own satisfaction. Plus, she's always been skipping class and coming in late in the mornings, only to be confronted by her class rep, Yoh. Aware of her own situation, she knows that she shouldn't leave any remaining desires and feelings behind...
• Santa ni Naritai (I Want to Become Santa)
• Koe ni Naru
Ever since something that frightened her as a child, Suzune hasn't spoken to anyone ever since. For a long time, she always thought to herself that she didn't need a voice, and that there were other ways of expressing her feelings. However, all of that changes when she meets the energetic and talkative Takuya.