  Domain model of QCD allows for description of wide range of meson
observables, dynamical chiral symmetry breaking, and resolution of $U_A(1)$ and
strong $CP$ problems. The purpose of the present study is transition
form-factor of neutral pseudoscalar mesons, and how they are influenced by the
typical vacuum configurations of the model -- almost everywhere homogeneous
Abelian (anti-)self-dual fields. Asymptotic behavior of the calculated pion
form-factor supports Belle trend, but the asymptotic value of
$Q^2F_{\pi\gamma^*\gamma}$ differs from the prediction of factorization
theorems.
