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We report on multicolour photometry of the short period dwarf novaCSS130418:174033+414756 during the 2013 superoutburst. The system showed anunusually short superhump period with 0.046346(67) d during stage A, which isone of the shortest periods among dwarf novae below the period minimum. Wefound that the bluest peaks in $g' - I_{\rm c}$ colour variations tend tocoincide with the brightness minima of the superhump modulations. We alsostudied nightly-averaged superhump amplitudes in $g'$, $R_{\rm c}$, and $I_{\rmc}$ bands and found that they have less dependence on wavelength. Theseproperties are likely to be in common with dwarf novae exhibiting superhumps.We successfully obtained $g' - R_{\rm c}$ and $R_{\rm c} - I_{\rm c}$ coloursduring the temporal dip. The colour indices were significantly bluer comparedwith other dips of WZ Sge-type dwarf novae. By using the period of the growingsuperhumps, we estimated the mass ratio to be $q$ = 0.077(5), which is muchlarger than the previous study.

OAO/MITSuME Photometry of Dwarf Novae. III. CSS130418:174033+414756