Collision ( PJSK AU) [ONGOING!!]

TW! some swearing, violence(?), bl00d mentions

KEEP IN MIND THAT THE CHARACTERS HERE ARENT MINE!! AND THIS IS JUST AN AU.
Story plot:
4 Sekais were formed by different feelings, those 4 people created a group consisting of 4 different people with the same motives. Those motives are all connected to songs which is somehow connected to their feelings. One faithful day while everyone was hanging out in their sekai they suddenly felt the ground shake as their phones starts to give a bright light. Once they opened their eyes they can see the other sekais, puzzled they also noticed 1 memeber from each group has gone missing. The vocaloids of each group were nowhere to be found too. They were all unable to go back to the real world at that point.

What will happen to these teenagers? will all of them see what was the cause of this collision?