The closing credits for 戦国BASARA-MOONLIGHT PARTY- have been uploaded to YouTube, so here's a two minute long version of 白露-HAKURO-
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And from the credits, it looks like it's a 100% GACKT composition. That's the first one since... EVER, over two years ago.
Source -
YouTube He's awesome and he knows it.
Now... RELEASE IT RELEASE IT RELEASE IT RELEASE IT RELEASE IT