@SARANAEL-T14
You make a valid point, I really see no reason why Mitchy hadn't been training his ass off during his free time. He obviously knows how dangerous being a delinquent can be first hand but he still makes no improvements.
Don't get me wrong, I love him as a Protagonist but there's no valid reason why he wouldn't take up a martial arts like Mikey-Kun.
One theory is that he dies during this fight and gets an all mighty reset to the very beginning so to not fuck things up. I would totally reread this just to see a more powerful and competent bitchy whooping ass!