  Understanding the nature of dark matter is one of the most exciting
challenges in fundamental physics nowadays, requiring the synergy of different
search techniques, as well as theoretical inputs. An interesting opportunity
for the investigation of dark matter is the one offered by the
\textit{B}-factories. The Belle~II experiment, located at the interaction point
of the SuperKEKB asymmetric energy $e^+e^-$ collider, is a new generation
\textit{B}-factory experiment operating at the Japanese KEK laboratory. With a
machine design luminosity of $6\times10^{35}\,\rm{cm}^{-2}s^{-1}$, Belle II
aims to record 50 ab$^{-1}$ of data within the next decade. Thanks to this
large data-sample and by using dedicated triggers, Belle~II is expected to
explore dark sector candidates with unprecedented sensitivity in the mass range
up to 10 GeV$/c^2$. During 2018, the experiment concluded a commissioning run,
collecting a data-sample corresponding to an integrated luminosity of about 0.5
fb$^{-1}$, while main operations started on March 2019 with an almost complete
detector. So far the experiment collected an integrated luminosity of $\sim90\,
\rm{fb}^{-1}$. With these data-sets Belle~II has already shown the possibility
to search for a large variety of dark sector candidates in the GeV mass range.
This paper reviews the status of the dark sector searches performed at the
Belle~II experiment, with a focus on the first obtained results and the
discovery potential with the data-set available in the short term.
