I dunno, I could see it go either way based on personal preference. I mean, on the one hand, Nekketsu is treated as a proper noun within the series and so it seems like something that would be OK to leave untranslated. Then again, "Hot-Blooded High" does have a rather interesting ring to it.
That said, I'm also thinking about other schools from the series for consistency. If Kunio attends Hot-Blooded High, then Riki attends Flower Garden High, which is... interesting
. On the other hand, the green team is the Inter-School Union, which sounds fine.
YMMV?(Disclaimer: I am not an experienced translator, just a fan.)
Oh, yeah, while I'm here...
not bad but logo needs some work
To be fair, that logo is from late '05/early '06 and I would do it differently if I ever restarted that hack.