We report the first observation of the radiative charm decay D super(0)arrowrightrho super(0)gamma and the first search for CP violation in decays D super(0)arrowrightrho super(0)gamma, varphigamma, and K super(*0)(892)gamma, using a data sample of 943fb super(?1) collected with the Belle detector at the KEKB asymmetric-energy e super(+)e super(-) collider. The branching fraction is measured to be Bernoulli(D super(0)arrowrightrho super(0)gamma)=(1.77+ or -0.30+ or -0.07)x10 super(?5), where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries scriptA sub(CP)(D super(0)arrowrightrho super(0)gamma)=+0.056 + or -0.152+ or -0.006, scriptA sub(CP)(D super(0)arrowrightvarphigamma)=?0.094+ or -0.066+ or -0.001, and scriptA sub(CP)(D0arrowright K super(*0)gamma)=?0.003+ or -0.020+ or -0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions Bernoulli(D super(0)arrowrightvarphigamma)=(2.76+ or -0.19+ or -0.10)x10 super(-5) and Bernoulli(D super(0)arrowright K super(*0)gamma)=(4.66+ or -0.21+ or -0.21)x10 super(?4).