  We reexamine the right-handed current effects in $b \to s$ transitions in
nonmanifest left-right models. Using the effective Hamiltonian approach
including all possible low-energy operators, we obtain especially the B \to K
\pi decay amplitudes including annihilation contributions, and investigate the
right-handed current contributions to CP asymmetries in $B \to K \pi$ decays.
Taking into account the constraints from global analysis of muon decay
measurements, |V_{ub}| measurements in inclusive and exclusive B decays, and
$B_s^0-\bar{B_s^0}$ mixing measurements, we find the allowed regions of new
physics parameters satisfying the current experimental data.
