I meant to introduce SS earlier, but kept forgetting.
Anyways, they all meet up on Zone 0 or at Dan's place, listening to Judge's quick tutorial on the game and advice.
And Judge also sends them to their land since the tutorial was a big part of all of their games, so next page, you'll be seeing their planets!! :D
And to explain the relations,
Dan and Vivaldi have a crush on each other, but they stay as friends since neither of them confessed yet
Kokoro and Dan are friends
Kokoro and Vivaldi are just eeeeh don't trust each other.
I don't own anything but the art