  In this paper, we impose a magic symmetry on the neutrino mass matrix
$m_{\nu}$ with universal four-zero texture and diagonal reflection symmetries.
Due to the magic symmetry, the MNS matrix has trimaximal mixing inevitably.
Since the lepton sector has only six free parameters, physical observables of
leptons are all determined from the charged leptons masses $m_{ei}$, the
neutrino mass differences $\Delta m_{i1}^{2}$, and the mixing angle
$\theta_{23}$.
  This scheme predicts $\sin \theta_{13} = 0.149$, that is almost equal to the
latest best fit, as a function of the lepton masses $m_{e, \mu}$ and the mass
differences $\Delta m_{i1}^{2}$. Moreover, even if the mass matrix has
perturbations that break the magic symmetry, the prediction of $\sin
\theta_{13}$ is retained with good accuracy for the four-zero texture with
diagonal reflection symmetries.
