GACKT Official Weibo update. Translation below:

“Decapitation -ZAN-” is a song that was also used in “Samurai Warriors 3” game. 
It’s Zipang rock.

“GACKT JAPAN TOUR 2016 LAST VISUALIVE Saigo no Tsuki -LAST MOON-“
“Decapitation -ZAN-“

Available worldwide! 
https://itunes.apple.com/jp/album/last-moon/1103545871

Get your DVD & Blu-ray here↓
https://gackt-store.online/

Search words are “GACKT”, “LAST VISUALIVE” & “LAST MOON”.

Click on the image below to see the video:

Source: GACKT WEIBO