No real explanation given to us except that humans went extinct, and animals feed off of each other in the "Tokyo Jungle", aka, the streets.
Animals evolved, developed territory, and food is running out so they go after each other.
Surprised the game was enough to warrant a Manga, but I think it turned out pretty alright as one even though it's just a oneshot.
Game was nothing special but it had a neat concept, had an average story, and you go around as an animal eating other animals and it goes from there.
If you can pick...
@kronix that's on you if you don't like any of them, lol.
A few other mangas have gone this route, giving a larger focus on other characters and I think they did it quite well here, being able to see all the different fighters instead of just Asura rising the ranks.
This one is a recommended...