Alright let me explain what's up:
Tomomi, and Akira have free-roam to do whatever they want with their particular rooms for the moment. If you try to open the door in your rooms you'll find it locked. However after the next post we'll get you out of there soon enough. The mask can have any design you want and you'll see what they're for soon enough.
As for Minto you'll be having your own dream but it won't be in this one. You didn't get the micguffin during the previous day, and rushed straight home after meeting Samuel. Meaning you'll probably end up getting your persona the hard way. What this dream will entail, and if you want me to help you with it will be all up too you.