I would just like to say that I absolutely LOVED this manga! I thought it was funny, creative, and I'm very excited to watch the anime! However, this is my first review, so bare with me as I try to explain this:
The first two volumes are filled with the characters' hilarious and short adventures that give you an idea of what their everyday life is like, but has no significant purpose other than making the reader laugh. The third volume is where things start to really heat up, as we learn more about the main character's backstory. Not to mention, at the end of every volume, there is a bonus chapter that reveals to us how the main characters come to meet.
I have to warn you; unlike most manga, this series is in bright (almost blinding) color. I personally loved that and thought it gave the series a unique feel to it, but if you prefer traditional manga, this may not be right for you.
The characters were probably my favorite part of the whole series! There were all so unique and carefully designed that I can't help but love them all. The five main characters are: Juugo, Rock, Uno, Nico, and Hajime.
Juugo Rock, Uno, and Nico are all inmates in Nanba prison, who share cell 13 in building 13 and are guarded by a prison guard named Hajime. Watching these characters interact and reveal their backstories was definitely my favorite part of this manga.
It was funny, colorful, unique, and starts to develop a plot later on in the series!
I loved it, and can't wait for the next chapter!