  Recent neutrino experiment results show a preference for the normal neutrino
mass ordering. The global efforts to search for neutrinoless double beta decays
undergo a broad gap with the approach to the prediction in the three-neutrino
framework based on the normal ordering. This research is intended to show that
it is possible to find a neutrinoless double beta decay signal even with normal
ordered neutrino masses. We propose the existence of a light sterile neutrino
as a solution to the higher effective mass of the electron neutrino expected by
the current experiments. A few short-baseline oscillation experiments gave rise
to a limit on the mass of the sterile neutrino and its mixing with the lightest
neutrino. We demonstrate that the results of neutrinoless double beta decays
can also narrow down the range of the mass and the mixing angle of the light
sterile neutrino.
