(You're Rui!)

It was just the normal chaotic night with the Lowermoons, and Rui is always somewhere in the chaos, either in the corner, in a spiderweb basket he made on the ceiling a while ago, or in general just somewhere within the complete chaos around him.

Enmu and Mukago: Talking about something random

Wakuraba and Kamanue: Playing Uno

Kyogai and Rokuro: Fighting about god knows what

(Notice how they're all in pairs? Rui doesn't really talk to the others.)