  We argue that coherent oscillations of the axion field excited by the
misalignment mechanism and non-thermal leptogenesis by the saxion decay can
naturally explain the observed abundance of dark matter and baryon asymmetry,
thus providing a solution to the baryon-dark matter coincidence problem. The
successful axionic co-genesis requires a supersymmetry breaking scale of
O(10^{6-7}) GeV, which is consistent with the recently discovered
standard-model like Higgs boson of mass about 126 GeV. Although the saxion
generically decays into a pair of axions, their abundance sensitively depends
on the saxion stabilization mechanism as well as couplings with the Higgs
field. We discuss various ways to make the saxion dominantly decay into the
right-handed neutrinos rather than into axions, and show that the abundance of
axion dark radiation can be naturally as small as \Delta N_{\rm eff} \lesssim
{\cal O}(0.1), which is allowed by the Planck data.
