  We present the photometry and spectroscopy of SN 2015an, a Type II Supernova
(SN) in IC 2367. The recombination phase of the SN lasts up to $\sim$120 d,
with a decline rate of 1.24 mag/100d, higher than the typical SNe IIP. The SN
exhibits bluer colours than most SNe II, indicating higher ejecta temperatures.
The absolute $V$-band magnitude of SN 2015an at 50 d is $-$16.83$\pm$0.04 mag,
pretty typical for SNe II. However, the $^{56}$Ni mass yield, estimated from
the tail $V$-band light curve to be 0.021$\pm$0.010 M$_\odot$, is comparatively
low. The spectral properties of SN 2015an are atypical, with low H$\alpha$
expansion velocity and presence of high velocity component of H$\alpha$ at
early phases. Moreover, the continuum exhibits excess blue flux up to $\sim$50
d, which is interpreted as a progenitor metallicity effect. The high velocity
feature indicates ejecta-circumstellar material interaction at early phases.
The semi-analytical modelling of the bolometric light curve yields a total
ejected mass of $\sim$12 M$_\odot$, a pre-supernova radius of
$\sim$388~R$_\odot$ and explosion energy of $\sim$1.8 foe.
