  We show that heavy quark axion is not necessarily a hadronic axion, which
manifests in the quark and lepton seesaw mechanism. We introduce a heavy
$SU(2)$ singlet fermion for each known fermion in order to unify the axion
scale and the seesaw scale. The light quarks and leptons gain their masses by
the seesaw mechanism. Even though our axion model gives a kind of heavy quark
axion, the axion has tree level lepton--axion coupling suppressed by $F_a$,
contrary to a widely known belief that heavy quark axions are hadronic.

High Energy Physics - Phenomenology