[DeepL Translation - needs review] Volume 1: Black believes in pure power. White believes in pure hearts; action unfolds between these two bad boys in the treacherous town of Takaracho. Be careful, it's dangerous! White and Black, boys who live in Treasure Town, are called cats and are feared in other towns. They do not attend school and lead a rough life, robbing money through violence.
(Translator: DeepL)
I guess that the most notable things about this manga is the art style and the weird setting. Overall, there’s a very Showa feel to it.
In terms of language learning, there isn’t much to expect. It’s mostly everyday conversations, with a little bit of gang/yakuza related vocabulary. However, almost everyone uses slang or speaks in a slurred way, so that’s good practice, if you are looking for that.
As of the first volume, not too much is happening. We are just learning about the different ch