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Remarkably, if $CP$ was spontaneously broken in the physics of inflation,fermions would notice and remember it. Based on that, we present a new(non-thermal) mechanism for generating self-interacting dark Dirac fermionsprior to the Hot Big Bang. The non-Abelian gauge fields and axions arewell-motivated matter contents for the particle physics of inflation. In thisbackground, we analytical study Dirac fermion doublets charged under the$SU(2)$ gauge field and use point-splitting technique to regularize thecurrents. We show that the non-trivial $CP$-violating vacuum structure of$SU(2)$-axion models naturally leads to an efficient mechanism for generatingmassive fermions during inflation. The size of the fermionic backreaction andthe density fraction of dark fermions put upper bounds on the fermion's mass.For a GUT scale inflation, the generated dark fermions, only gravitationallycoupled to the visible sector, can be as heavy as $m\lesssim 10 TeV$.

Dark Fermions and Spontaneous $CP$ violation in $SU(2)$-axion Inflation