  We propose a new model for explaining the diphoton excess observed at the
LHC. The uniqueness of our model is that this excess is being produced by
photon-photon induced sub-process. The model includes an isospin $3/2$ scalar
multiplet (having triply, doubly and singly charged scalars) at the electroweak
(EW) scale to explain the observed neutrino masses via the effective dimension
$7$ operator. The model also include a singlet scalar which is the di-photon
resonance. The loop induced coupling of the singlet scalar with a pair of
photons is enhanced due to contributions from multi-charged EW-scale scalars
(component of isospin $3/2$ multiplet) in the loop. We examine the production
of the singlet scalar at the LHC via photon-photon fusion sub-process and its
subsequent decay to di-photon. We found that a large part of parameter space of
the present model can explain the observed excess of di-photon events at the
LHC. We also study the other decay modes of the singlet scalar and the ensuing
predictions can be tested in the upcoming runs at the LHC.
