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Rebecca Miyamoto's personal research laboratory.
The MRM was originally created as a safe haven for Rebecca to perform research and experiments on subjects of interests. Shortly after its creation, Ichijo altered the sign to say that this was actually a counseling room where Rebecca would listen to the problems of anyone who stopped by. The sign was returned to normal but the damage had already been done. To this day, the room is mainly used for talking with students or Class 1-C coming up with a plan to escape whatever predicament they've found themselves in.