I found it Arashi fans!!! Here’s the behind-the-scenes story about “Carnival Night Part 2”. This was in Myojo’s album mini booklet(?), “Young Song”(November, 2006).
Question by Emi, Gunma prefecture: “In Arashi’s album, ‘Arashic’, there’s a song called ‘CARNIVAL NIGHT part 2’. Is there Part 1?”
Let’s ask Sakurai-san! “We didn’t actually record it, but there was part 1. We actually had to revise the lyrics multiple times for this song. The chorus, ♪CARNIVAL NIGHT〜, was ♪水金地火木、土天海、冥！〜 (*note: Sui Kin Chi Ka Moku, Dot Ten Kai, Mei!) lol. Turns out Pluto is no longer a planet anymore, so we changed the lyrics… But we felt bad for the lyricist, so we named the completed one ‘Part 2’. Just to sort out our feelings.”
OMG. somebody tell them that pluto is a planet now (i think they recently found that there are moons around pluto??) so release the part 1!!