Source extendedness defined as the difference between the PSF and CModel magnitudes, as a function of the HSC magnitudes (z_AB for i-band dropouts and y_AB for z-band dropouts), for the SHELLQs quasars (blue dots), galaxies (green dots), [O iii] emitters (light blue dots), brown dwarfs (red dots), and the previously known quasars recovered in our HSC survey (blue open circles). The SHELLQs quasars with narrow Lyα lines are marked with the larger circles. All the sources discovered in Paper I and this work are plotted. The dotted line represents the extendedness cut (m_AB − m_{CModel, AB} < 0.15) of our quasar selection; note that some objects exceed this limit, since they were selected with the older HSC photometry or with our previous selection threshold (see text).