We study the structural change of the vector spectral function and integrated
production rates of dileptons in the presence of the chiral mixing induced
at finite density. The mixing produces multiple bumps and peaks around the
masses of the $\rho, \omega$ and $\phi$ resonances in the spectral function.
The arising modification becomes pronounced when the mass difference between
parity partners decreases. In particular, the emergent enhancement around the
vacuum $\phi$ meson in the production rates serves as an excellent signature
of the partially-restored chiral symmetry in heavy-ion collisions.