Struggle in music

STARISH and Nanami Haruka are having trouble with the concert showdown with HEAVENS. And when they're just gonna give up, Shining Saotome suddenly pops out of nowhere and said to them that they will go in a work-related place. The next day, the group and their composer went to the office of their president, but suddenly a bright light appeared and they were standing right in front of the door of the Mastercourse. But wait! Were they just inside of the building? Find out here what happens in Trouble in the future.

Reuploaded and fixed from my old account @fina_elememt21.