The best manga I have ever read, and I've read a few. Even for Urasawa's standards, this was an absolutely phenomenal read.

Story: 10/10
Gripping yet heartwarming. The final message was beautiful, a critique of society but with a message of hope. The last chapter was absolutely amazing.

Art: 10/10
Beautiful art, but that's to be expected of Urasawa. The landscape panels, the character designs and how they aged. I thought the little billy bat segments were cute and felt like a standalone comic on it's own with it's unique art-style.

Characters: 10/10
All the characters are likable in their own way. They have depth, motivations, hopes, even the fictional characters feel like real people. It sends a powerful message that every person has a story to tell. Even without the beautiful art and interesting story, I'd recommend this manga because of its characters.

Enjoyment: 10/10
The beginning was a bit slow but after the 3rd volume, it becomes a manga that's impossible to put down. I enjoyed every single page of it and I plan on eventually reading it again, just to relive everything again.

Overall: 10/10
This is my first time giving a manga a perfect 10. Sometimes I give them an overall 10 but a 9 in one or two of the aspects but in this case, everything's a ten. I'll recommend it to anyone no matter what genre they're into, because I think Billy Bat has something for everyone.