RE:COM help

[Gabranth]

RE:COM help

I know this is for RE:COM but there isn't a forum for it and that the one you get from final mix is a little different but meh...
Anyway how do open doors that have a weird door sign on it? I have been wanting the cards in these rooms

 

[Atra]

Mabye with the tresure Card
i don have final mix so i dont really no