There is a beat pause, before Togusa's peals of laughter follow Tatsuo up the hallway.

Someone (likely Koutarou) has already been through Togusa's apartment. The temperature is turned down, and Daisuke has been whisked away for doggie pampering until Togusa gets out. The binder is right where he said it would be, given a dubious place of honor right next to the copy of Catcher in the Rye.

Togusa is awake again when Tatsuo returns, but he clearly napped for a bit.