I seem to be too dense to comprehend this thing.
As I'm not able to enter my own house (?), I go to the left with the girl character, so that I can see a map with no way to escape anymore
. That is, I can either look, talk or - something else I cannot remember anymore - anything else but WALK! And it seems purpose, as you can change the action with the right mouse button - there are definitely only those three!