"Your Best Nightmare - Yume 2kki" is a super duper epic medium-high quality vip of "Your Best Nightmare" from Yume 2kki.
Joke[]
This is an arrangement of "Fairy Tale Path" from Yume 2kki in the style and instruments of the advertised track, including each segment of it.
"Your Best Nightmare" is not a track from Yume 2kki, it is a track from Undertale.