  If a galactic supernova explosion occurs in the future, it will be critical
to rapidly alert the community to the direction of the supernova by utilizing
neutrino signals in order to enable the initiation of follow-up optical
observations. In addition, there is anticipation that observation of the
diffuse supernova neutrino background will yield discoveries in the near
future, given that experimental upper limits are approaching theoretical
predictions. We have developed a new supernova event simulator for water
Cherenkov neutrino detectors, such as the highly sensitive Super-Kamiokande.
This simulator calculates the neutrino interaction in water for the two types
of supernova neutrinos described above. Its purpose is to evaluate the
precision in determining the location of supernovae and to estimate the
expected number of events related to the diffuse supernova neutrino background
in Super-Kamiokande. In this paper, we describe the basic structure of the
simulator and its demonstration.
