Juicy Fragrance was a song Nakata made for Perfume when he first started producing for them. Emphasis on "was" because he accidentally deleted it before it was finished.
You can watch a video of them talking about the songs and singing the tune here. It sounded like a cute song, it's a shame it will likely remain lost forever.
Interestingly, they also talked about the song during a 2020 "POPFES" livestream. You can see a clip here.back