"Relations" is Signal-P's sixth album; the previous being Prism. It is said that after a whole year this is a sequel to Signal-P's album "DioSignal". The tracks from SIGNALOID ALBUM, SIGNALOID SOUNDS, and DioSignal are featured here; with track number 15 being an arrangement by Hanataba-P.
Notable songs in the album include "Transmit", "Rin Rin Signal", and "CHU! Shite!". "New" songs from the album include "repeated regret". The mixing done by the album is "DSD Remastering". The 9th track is sung by GUMI, and is Signal-P's first song to feature GUMI.