  Motivated by the flavored Peccei-Quinn symmetry for unifying flavor physics
and string theory, we investigate a supersymmetric extension of standard model
(SM) for an explanation of inflation and leptogenesis by introducing $U(1)$
symmetries such that the $U(1)$-$[gravity]^2$ anomaly-free condition together
with the SM flavor structure demands additional sterile neutrinos as well as no
axionic domain-wall problem. Such additional neutrinos may play a crucial role
as a bridge between leptogenesis and new neutrino oscillations along with high
energy cosmic events. In a realistic moduli stabilization, we show that the
moduli backreaction effect on the inflationary potential leads to the energy
scale of inflation with the inflaton mass in a way that the power spectrum of
the curvature perturbation and the scalar spectral index are to be well fitted
with the latest Planck observation. We suggest that a new leptogenesis scenario
could naturally be implemented via Affleck-Dine mechanism. So we show that the
resultant baryon asymmetry, constrained by the sum of active neutrino masses
and new high energy neutrino oscillations, crucially depends on the reheating
temperature $T_{\rm reh}$. And we show that the model has a preference on
$T_{\rm reh}\sim10^3$ TeV, which is compatible with the required $T_{\rm reh}$
to explain the baryon asymmetry of the Universe.
