MASTER OT J030227.28+191754.5: WZ Sge-type dwarf nova having the largest outburst amplitude We reported the results of our spectroscopic and photometric observations to ATel: https://www.astronomerstelegram.org/?read=15074 Within one day, the spectra had significantly changed to that of typical dwarf nova. We also detected early superhump-like modulations. Thus this object will be the WZ Sge-type dwarf nova having the largest outburst amplitude so far.