nuit
words, music, arranged by 春野 (haruno)
the artist's homepage
Tumblr
Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. It's where your interests connect you with your people.xupxq.tumblr.com
It's originally sung by a vocaloid 初音ミク Hatsune Miku. The one in your video is covered by someone else.