Definitely! The Hajime no Ippo manga has a compelling plot with lots of exciting boxing matches and emotional character arcs. The way it portrays the sport and the growth of the main character makes it really enjoyable.
One idea could be a crossover where Naruto characters learn boxing from the characters in Hajime no Ippo. For example, Naruto might be intrigued by the discipline and physical training involved in boxing and want to incorporate it into his ninja training. It could lead to some interesting sparring scenes between the two groups of characters.
One idea could be a crossover with 'Dragon Ball'. Ippo could train with Goku and learn some of his ki - based techniques. This would not only make Ippo stronger in the boxing ring but also introduce a new element to his fighting style.
I'd suggest checking out local comic conventions or fan events. Vendors at those places sometimes have rare or hard-to-find manga box sets like the Hajime no Ippo one in English. Another option could be reaching out to manga fan forums or groups to see if anyone has leads on where to find it.