It makes a whole lot more sense if you’ve ever experienced rainy season, too lol.
Back in my home town, there was a high chance of it being sunny on July 1st, so I never really felt this aspect of the lyrics—but Japanese rainy season is still in full swing, so it’s actually on the rarer side for it to be sunny and clear.
In any case, it’s one of my favorite songs haha. And a karaoke staple
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"Remember, don't let others dictate your music taste. If you like whatever you're listening to, keep listening to it."