  We present the $g'$-, $R_{\rm c}$-, and $I_{\rm c}$-band magnitudes and
associated colors of the Starlink's STARLINK-1113 (one of the standard Starlink
satellites) and 1130 (Darksat) with a darkening treatment to its surface. By
the 105 cm Murikabushi telescope/$\it{MITSuME}$, simultaneous multicolor
observations for the above satellites were conducted four times: on April 10,
2020, May 18, 2020 (for Darksat), and June 11, 2020 (for Darksat and
STARLINK-1113). We found that (1) $g'$-band apparent magnitudes of Darksat
($6.95~\pm~0.11-7.65~\pm~0.11$ mag) are comparable to or brighter than that of
STARLINK-1113 ($7.69~\pm~0.16$ mag), (2) the shorter the observed wavelength
is, the fainter the satellite magnitudes tend to become, (3) the reflected flux
by STARLINK-1113 is extremely ($> 1.0$ mag) redder than that of Darksat, (4)
there is no clear correlation between the solar phase angle and
orbital-altitude-scaled magnitude, (5) by flux-model fitting of the satellite
trails with the blackbody radiation, it is found that the albedo of Darksat is
about a half of that of STARLINK-1113. Especially, the result (1) is
inconsistent with the previous studies. However, considering both solar and
observer phase angles and atmospheric extinction, the brightness of
STARLINK-1113 can be drastically reduced in the $g'$ and $R_{\rm c}$ band.
Simultaneous multicolor-multispot observations more than three colors would
give us more detailed information regarding the impact by the low Earth orbit
satellite constellations.
