  We present a new mechanism of fluctuation-induced Nambu-Goldstone bosons in a
scalar field theory of Higgs-Josephson systems. We consider a simple scalar
field model with $U(1)^n$ rotational symmetry. When there is an interaction
which violates the rotational symmetry, the Nambu-Goldstone bosons become
massive and massless bosons are concealed. We present a model where the massive
boson becomes a massless boson as a result of the perturbative fluctuation. In
our model the ${\bf Z}_2$-symmetry associated with the chirality is also
broken. The transition occurs as a (weak) first-order transition at the
critical point. The ground state at absolute zero will flow into the state with
more massless bosons due to fluctuation effects at finite temperature.
