3xxxv5 is the first track of 35xxxv album. This track serves as the introduction or opening track for the album. In the beginning of the song we can hear a synth sound that used by ONE OK ROCK in their opening at Mighty Long Fall live at Yokohama Stadium 2014.
Taka talked about making this song:
This is a symbol of the darkness and the light which will be shined in the dark. even thought, this is the main song of this album but eventually we composed it the last.