  We study a radiative neutrino model with a SU(2) septet scalar with
hypercharge $Y=2$ where active neutrino mass is induced at a one-loop level.
Calculating a one-loop diagram, mass matrices for active neutrino is derived.
We also analyze lepton flavor violations, anomalous magnetic moment of muon and
the flavor violating Higgs decay $h \to \mu \tau$. Then sizable muon $g-2$ and
$\sim 1 \%$ of $BR(h \to \mu \tau)$ could be obtained in our set up.
Furthermore, the collider signature of the septet is discussed where we focus
on quadratically charged scalar at the LHC 14 TeV. We find that it could be
discovered up to $1.5$ TeV mass by searching multi charged lepton signal
events.
