This is a different version of their new song "ray" which is included in their latest album titled [RAY]. Digital versions went on sale at the same time the album was released, and got 1st in the iTunes Store ranking. This collaboration has attracted the attention of music fans and Japanese pop culture fans alike.
The official website has also posted an interview with the band members as to how this collaboration happened. Hatsune Miku's official YouTube channel has uploaded a behind-the-scenes documentary about the making of the video.
Source:
http://blog-imgs-50-origin.fc2.com/e/b/i/ebianjohnnysmatome/20130517123413c16.jpg
