  We clarify the two-channel Kondo effect in the seven-orbital Anderson model
hybridized with $\Gamma_8$ conduction electrons by employing a numerical
renormalization group method.From the numerical analysis for the case with two
local $f$ electrons, corresponding to Pr$^{3+}$ or U$^{4+}$ ion, we confirm
that a residual entropy of $0.5\log 2$, a characteristic of two-channel Kondo
phenomena,appears for the local $\Gamma_3$ non-Kramers doublet state. For
further understanding on the $\Gamma_3$ state, the effective model is
constructed on the basis of a $j$-$j$ coupling scheme. Then, we rediscover the
two-channel $s$-$d$ model concerning quadrupole degrees of freedom. Finally, we
briefly introduce our recent result on the two-channel Kondo effect for the
case with three local $f$ electrons.
