This manga can be considered a prequel to the Shirobako anime. It tells how the group of friends got together and shared their passion for anime trying to create their own.
Each of them bring something different. Someone wants to be a future voice actress, another one wants to animate CG and there is the one who isn't sure if she should pursuit her dream of drawing.
It is a lovely story where the girls put their efforts together and try to overcome sticky situation. It feels more serious than the anime when it comes to managing deathlines and how it affects certain characters.
The story is still more light hearted and doesn't go full depression mode.
The art is lovely and the girls look very cute. It is fun too look at the images sometimes and there are many scenes where each character just stand out.
If you have seen Shirobako, I think you owe yourself to read this manga.