Yo if there is anyone left someone should investigate the cafeteria. there's an 'E' carved on the door with something sharp.
Also the burner in the kitchen was used jsyk.
As for Kirigiri just because they were the detective in the game doesn't make it any less likely that they can't be despair in this game. I mean, even Naegi can be Despair in this game and he's the Ultimate Hope in the actual game. The first post also has Hope/Despair beside Kirigiri so ruling her out as a possible Despair at this point could be a mistake. As for her being awake it's possible that she is hope and is using a detective role at night but eh. I just wish to be weary for now.