Warning: This song contains explicit lyrics and themes (suicide); it may be inappropriate for younger audiences.
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"+BE MY SACRIFICE+"
Uploaded November 8, 2008, with 43,100+ Niconico views
The lyrics are very vague, but it might be that Miku was tired of this world and wanted to leave the place. But the only way she can leave is if someone sacrificed for her. Since there's no one to help her or offer her a sacrifice, she commits suicide herself.