Well, she was one of the first japanese female artists to have a collaboration with a korean band, right? LAST ANGEL was just months after the first "hit" from Tohoshinki. And that was before the whole "korean wave" that started years after the single.
@KuuXAyu-fan I can see being a mu-mo single if the album is released during the same month or something like that.
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The blu-ray rip is up on youtube:
KODA KUMI LIVE TOUR 2016 ～Best Single Collection～
https://www.youtube.com/watch?v=Y808ZIR-ewY&t=1375s