There is no speech in Gon. There is only 1 named character. There is essentially no explanation given for why anything is happening.There is only Gon.

Gon is the creation of Masashi Tanaka and the character is most recognisable outside of Japan from his appearance in Tekken 3. As a tekken player myself, I had heard Gon had came from a manga but I never really looked into it.
After finishing SunKenRock I wanted to read something else with good art and was recommended Gon. I was pleasantly surprised whilst reading the first chapter to find out there was no dialogue. A very interesting stylistic choice made by Tanaka , he says the reason for this is because
"From the beginning, I didn't think it was necessary. Manga should be without grammar. I also think that it is strange to give animals human language and make them talk. What I set out to do with Gon was to draw something that was more interesting than anything you could say in words. Manga still has great potential that does not exist in other media. I plan to continue developing the art of expression."
Although having a lack of dialogue is a obvious drawback to any series, it is more than made up for with the use of visual storytelling

Visual Storytelling is quite simple to explain , it's when a story can be told through the use of imagery alone.
Gon is a masterclass on how to pull of visual storytelling.
Through it's amazing art and how Masashi Tanaka can display emotion through art brings the story to life.
Anyone can enjoy Gon to it's full extent no matter who they are as it appeals to such a wide audience
It's hard to explain why Gon is so captivating due to the incredibly simplistic nature of it but I do highly recommend reading it so you can see for yourself