TRIGGER goes missing when they're scheduled to perform at the Tokyo International Music Art Festival, so IDOLiSH7 and Re:vale work together to look for them. Ryunosuke is rescued sooner than the others thanks to Nagi's quick wits and rushes to Zero Arena, but...
I see. We need to separate 
the king from the rook.
هكذا إذاً. علينا أن نعزل الملك عن الرخّ
Ach so. Wir müssen den König
vom Turm trennen.
Cierto. Solo debemos hacer un enroque.
Mais oui…
Il suffit de séparer le roi de la tour.
Ci sono. Dobbiamo allontanare il Re dalla Torre.
É isso.
Precisamos separar o rei da torre.
Точно... Надо отделить короля от ладьи.