Great work on the translation, I appreciate seeing the two different versions! My favorite characters are actually the student council, so I hope we'll get to see them make their trip before the series ends (I'm assuming the series will end pretty shortly after graduation).
the translation's fine. the explanation page with the literal translation in the end helped make up for potential call-outs to translation errors. really liked the expalation page in the end.
Thanks for all your efforts! I think you did a great job, better than how many official translations handle other foreign media. I think it was definitely the right call to account for cultural differences but still try and preserve the author's intent as much as possible. The explanation page also provides an opportunity to learn more about the original culture - like in this case the Japanese proverb.