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Using $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ data collected bythe Belle detector, we discover a new resonant three-body decay$\Omega(2012)^-\to \Xi(1530)^0 K^-\to\Xi^-\pi^+K^-$ with a significance of5.2$\sigma$. The mass of the $\Omega(2012)^-$ is $(2012.5\pm0.7\pm0.5)$ MeV andits effective couplings to $\Xi(1530)\bar{K}$ and $\Xi\bar{K}$ are$(41.1\pm35.8\pm6.0)\times10^{-2}$ and $(1.7\pm0.3\pm0.3)\times10^{-2}$, wherethe first uncertainties are statistical and the second are systematic. Theratio of the branching fraction for the resonant three-body decay to that forthe two-body decay to $\Xi\bar{K}$ is $0.97\pm0.24\pm0.07$, consistent with themolecular model of $\Omega(2012)^-$, which predicts comparable rates for$\Omega(2012)^-$ decay to $\Xi(1530)\bar{K}$ and $\Xi\bar{K}$.

Observation of $\Omega(2012)^- \to \Xi(1530)\bar{K}$ and measurement of  the effective couplings of $\Omega(2012)^-$ to $\Xi(1530)\bar{K}$ and  $\Xi\bar{K}$