  This paper report results from the first long-term BV(RI)c photometric CCD
observations of three variable pre-main-sequence stars collected during the
period from February 2007 to January 2020. The investigated stars are located
in the field of the PMS star V733 Cep within the Cepheus OB3 association. All
stars from our study show rapid photometric variability in all-optical
passbands. In this paper, we describe and discuss the photometric behavior of
these stars and the possible reasons for their variability. In the light
variation of two of the stars we found periodicity.
