The song of the PV is Gravitation by Angela. It’s the opening of an anime series called Heroic Age. To be honest, mecha type of anime is really not my cup of tea. Most of the time it’s just coincidence, not that I specifically look for it; since I like the song, it’s the main reason why I keep watching Heroic Age until the end . Well, enjoy the song, although I personally do have high hope for the PV to be a little bit different…still not bad though