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We present three-band simultaneous observations of a weak-line T-Tauri starCVSO~30 (PTFO~8-8695), which is one of the youngest objects having a candidatetransiting planet. The data were obtained with the Multicolor SimultaneousCamera for studying Atmospheres of Transiting exoplanets (MuSCAT) on the 188 cmtelescope at Okayama Astrophysical Observatory in Japan. We observed the fadingevent in the $g^{\prime}_2$-, $r^{\prime}_2$-, and $z_{\rm s,2}$-bandssimultaneously. As a result, we find a significant wavelength dependence offading depths of about 3.1\%, 1.7\%, 1.0\% for the $g^{\prime}_2$-,$r^{\prime}_2$-, and $z_{\rm s,2}$-bands, respectively. A cloudless H/Hedominant atmosphere of a hot Jupiter cannot explain this large wavelengthdependence. Additionally, we rule out a scenario by the occultation of thegravity-darkened host star. Thus our result is in favor of the fading origin ascircumstellar dust clump or occultation of an accretion hotspot.

Multi-Color Simultaneous Photometry of the T-Tauri Star Having A Planetary Candidate CVSO 30