Along the path for the true ending, it is discovered that the past has been manipulated through malice creating different past era whose snowballing malice ended with the destruction of the world...

Nep as in Neptune > turned into NepBike making IF a driver of the NepBike throughout the timelines. or simply put, a "Nepdriver"

"The normal path of the game's future" is recurring throughout the song. It literally describes the path the player takes to the True Ending, due to all key events eventually leading to the True...