A new (the third) song and sequence has since been added to World Trigger (since Ep.49) with the track titled "Dream Trigger (ドリームトリガー)" - as performed by Pile, with the "Music Video Short Ver." of the live MV featured above. Screengrabs of the anime opening sequence has since been uploaded HERE on #iNotOtaku! FB :)
"Pile (パイル) (Real Name: Hori Eriko / 堀絵梨子) is a singer and seiyuu represented by SPACEY. She is of both Japanese and Korean descent." (generasia.com). Born May 2, 1988 (age 27), you can check out her main website at pile.asia … and while we await the actual MV for the song, here's a look at her previous single "キミがくれたKISEKI" (short version).