Hakujitsu「白日」- King Gnu (Piano Synthesia)

I made this by request.
Despite the title saying "White Day", does this song has anything to do with romantic love?
I mean when I see the lyrics It talks about past regrets in general and how we should keep moving forward in life without mentioning anything about love... did I miss something?? Or is there another meaning of "White Day" that I don't know?
Regardless of that, Happy Valentine's Day everyone!!
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Original Artist : King Gnu
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