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Uploaded October 10, 2014, with 929,100+ Niconico views and 1,197,000+ YouTube views
"Happy Halloween" is a Halloween-themed song produced by Junky after a long break (about 1 year and 7 months).
The song is about a girl who became addicted to Halloween after eating some sweets, as well as Halloween in general.
It is included as a track in the Halloween-themed USB stick produced by "U/M/A/A Inc.", sold as part of a promo for the Halloween and VOCALOID-themed campaign of Famima!! titled, "Trick or Miku". This song has entered the Hall of Fame and exceeded 1 million views on YouTube.