  We propose a novel and simple scenario to explain baryon asymmetry and dark
matter (DM) by utilizing an early matter-dominated era (EMDE) caused by a heavy
metastable particle. Within the EMDE, lack of pressure enhances the formation
of primordial black holes (PBHs) which can then contribute to the relic
abundance of DM. The eventual decay of heavy metastable particle that has
baryon number and $CP$ violating interactions reheats the Universe and gives
rise to baryon asymmetry. Since in this setup, PBH serves as a DM candidate,
the particle physics model may not require new stable degrees of freedom which
leads to more freedom in the model-building side. As an example, we show that a
modulus field which dominates the energy density of the Universe prior to its
decay, may explain both DM and baryon asymmetry in the Universe in the context
of the Minimal Supersymmetric Standard Model (MSSM) while the lightest
superparticle is not stable and cannot be a DM candidate due to the R-parity
violating interactions needed for baryogenesis.
