  The majoron is a well-motivated light (pseudo-Nambu-Goldstone) boson
associated with the spontaneous breaking of a global lepton-number symmetry. In
this {\it letter}, we relate the spontaneous breaking scale and its
soft-breaking mass by requiring that the majoron is the main component of the
dark matter. An electromagnetic-anomalous coupling can be induced by minimally
modifying the original majoron model, surprisingly, predicting a parameter
region that largely overlaps with the QCD-axion dark matter band. Thus, we
expect that axion search experiments meet the majoron.
