I、D、Z ～LEGEND "Z" was a concert held on February 1, 2013, at Zepp Tokyo in Tokyo, Japan. The show concluded with the announcement of their next concert, LEGEND "1999", confirming the continuance of their group activities. SU-METAL had recently graduated from Sakura Gakuin, and there was much anticipation regarding her future endeavors with BABYMETAL.

• Music