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We report a measurement of decay-time dependent $CP$-violating parameters in$B^0 \rightarrow K^0_S K^0_S K^0_S$ decays. We use $(198.0 \pm 3.0) \times10^6\ B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with theBelle II detector at the SuperKEKB asymmetric-energy $e^+e^-$ collider. Theobserved mixing-induced and direct $CP$ violation parameters are $\mathcal{S} =-1.86\ _{-0.46}^{+0.91}~{\rm (stat)} \pm 0.09~{\rm (syst)}$ and $\mathcal{A} =-0.22\ _{-0.27}^{+0.30}~{\rm (stat)} \pm 0.04~{\rm (syst)}$, respectively.

Measurement of decay-time dependent $CP$ violation in $B^0 \rightarrow K^0_S K^0_S K^0_S$ using 2019--2021 Belle II data