Warning: This song contains questionable lyrics and themes (Suicidal Themes); it may be inappropriate for younger audiences.
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Romaji: Goosuto Ruuru
Official English: Ghost Rule
Uploaded January 8, 2016, with 6,444,000+ Niconico views and 11,852,000+ YouTube views
Hey, it's DECO*27. Thank you all so much for making this song get to where it is today.
— Author's comment
"Ghost Rule" is an original song by DECO*27. It is one of his first songs after a brief hiatus in making music (at least in the Vocaloid field).
One interpretation of the song is that Miku is a compulsive liar, whose life has been ruined by her constant contradictions and lies. She slowly starts to give up and no longer care about anything. In the end, she possibly commits suicide.
It is more likely, however, that the song is not about Miku at all, but is instead sung in the perspective of a boy. This is because Miku refers to herself as「僕」(pronounced "boku"), which is used to imply that the speaker is a boy. In Japanese music, female singers often use this word when portraying a song's point of view to be that of a male.
This song became an instant hit on Nico Nico, entering the Hall of Fame within the week of its publication. It later entered the Hall of Legend and exceeded over 10 million YouTube views. Hence, this is DECO*27's most notable song, and one of Miku's most notable songs.