  NMSSM has enough ingredients to explain the diphoton excess at 750 GeV:
singlet-like (pseudo) scalar ($a$) $s$ and higgsinos as heavy vector-like
fermions. We consider the production of the 750 GeV singlet-like pseudo scalar
a from a decay of the doublet-like pseudo scalar $A$, and the subsequent decay
of $a$ into two photons via higgsino loop. We demonstrate that this cascade
decay of the NMSSM Higgs bosons can explain the diphoton excess in the 13 TeV
data consistently with the absence of a significant excess in the 8 TeV data.
