Place it immediately after the on-screen departure notice, then follow it with the Discord Notification for another beat that keeps the chat joke moving, and close with the Vine Boom when the reaction lands.
このサウンドについて
This is a very brief spoken Portuguese line announcing that another person has just left the group, delivered in a flat, matter-of-fact voice that makes the departure sound routine. It feels dryly funny and a little awkward, like a deadpan announcement in the middle of a busy chat, and it works because the words land as a small, pointed comment on someone slipping away unnoticed.