V-band images of KSP-OT-202104a. Panel (a) is a quiescent phase image made by stacking 549 60 s exposures obtained during MJD = 58795.27–59298.86 before the superoutburst. Panel (b) is the first detection image at MJD = 59313.40; (c) is a near-peak image of the superoutburst at MJD = 59314.01; and (d) is the last image during the declining part at MJD = 59339.05. The labels (a)–(d) coincide with those in the light curve in Figure 1. North is up, and east is to the left. Crosshairs mark the position of KSP-OT-202104a. Horizontal bars of 5″ are shown in the bottom-left corners.