Peeking into a dream...?

I think I've played quite a bit... but this is the first time it's appeared (Koji) It requires 5 pieces, so it's paid, but... this was my first time experiencing it as a sudden event. I thought something like this is better than weird mobs interrupting, as it doesn't ruin the atmosphere. The content is about 5 pages long. The moon and stars were scattered in the background, and it looked nice. I wonder if it's only for Koji or Luca, perhaps?