Reimian Empire

Tsukiko wanted to clear her head after that attack, but she found that not only was she unharmed, her mind was even clearer than before. Strange.
The girl peers into the darkness of the corridor, to see if anything is there.
"The doors have been working so far... But how is this place arranged?"
If nothing is visible at the end of the corridor (which is probably the case), she opens the door.