  We explore a model based on the classically-scale invariant standard model
(SM) with a strongly coupled vector-like dynamics, which is called hypercolor
(HC). The scale symmetry is dynamically broken by the vector-like condensation
at the TeV scale, so that the SM Higgs acquires the negative mass-squared by
the bosonic seesaw mechanism to realize the electroweak symmetry breaking. An
elementary pseudoscalar $S$ is introduced to give masses for the composite
Nambu-Goldstone bosons (HC pions): the HC pion can be a good target to explore
through a diphoton channel at the LHC. As the consequence of the bosonic
seesaw, the fluctuating mode of $S$, which we call $s$, develops tiny couplings
to the SM particles and is predicted to be very light. The $s$ predominantly
decays to diphoton and can behave as an invisible axion-like dark matter. The
mass of the $s$-dark matter is constrained by currently available cosmological
and astrophysical limits to be $10^{-4} {\rm eV} \lesssim m_s \lesssim 1 \,{\rm
eV}$. We find that the sufficient amount of relic abundance for the $s$-dark
matter can be accumulated via the coherent oscillation. The detection potential
in microwave cavity experiments is also addressed.
