"es" is a psychological term that refers to the core of the unconscious mind. A place in your field of emotions that you can hide from all other people. DuelJewel based the concept of this single around this and for them it mimics their song writing algorithm of being in the spot that isn't quite in the conscious mind but also not quite a part of the unconscious mind. Hayato's lyrics evoke raw emotion. The second track, outsider is a tribute to their raw side. This release marks a major turning point in the band, which was accelerated by the band's new studio engineers.