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The CKM angle $ \phi_{3} $ is the only angle of the unitarity triangle thatis accessible with tree-level decays in a theoretically clean way. The Belle IIexperiment is a substantial upgrade of the Belle detector and will operate atthe SuperKEKB energy-asymmetric $ e^{+}e^{-} $ collider. The accelerator hasalready successfully completed the first phase of commissioning, with the first$ e^{+}e^{-} $ collisions recorded in 2018. The design luminosity of SuperKEKBis 8$ \times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims torecord 50 ab$ ^{-1} $ of data, a factor of 50 more than the Belle experiment.The key method to measure $ \phi_{3} $ is through the interference between $B^{+} \to D^{0}K^{+} $ and $ B^{+} \to \overline{D}^{0}K^{+} $ decays, whichoccurs if the final state of the charm-meson decay is accessible to both the $D^{0} $ and $ \overline{D}^{0} $ mesons. To achieve the best sensitivity, alarge variety of $ D $ and $ B $ decay modes are required, which is possible atthe Belle II experiment as almost any final state can be reconstructed,including those with photons. With the ultimate Belle II data sample of 50 ab$^{-1} $, a determination of $ \phi_{3} $ with a precision of 1$^{\rm o} $ orbetter is foreseen.

Measurement of CKM angle $\boldsymbol{ \phi_{3}} $ at Belle II