It was the song I was waiting for the most when it was announced several weeks ago. It's a total blast, I love it! It's great to see some more backstory as well, no matter how dark it is.
So, the visuals mainly show Dai's backstory. It's not joyful at all, his parents were human trash. The lyrics kind of depicts how society and people are fake. I can't be 100% sure about anything more precise, the song is weird to translate.