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We investigate a radiative seesaw model under a non-holomorphic modular S <SUB>3</SUB> flavor symmetry, addressing neutrino masses, dark matter candidates, and lepton flavor violations. Neutrino masses arise at the one-loop level, and we confront the model with neutrino oscillation data, lepton flavor violation bounds, and relic density requirements through a chi-square analysis. By incorporating the latest JUNO results, we find that the allowed parameter space is strongly constrained: For the normal hierarchy, both fermionic and bosonic dark matter scenarios remain viable but highly localized, whereas for the inverted hierarchy with fermionic dark matter no allowed region survives. These findings demonstrate that JUNO provides decisive constraints and that our framework is highly predictive.