Abundances of heavy elements in metal-poor stars help us understand the astrophysical sites of elements and evolutionary histories of galaxies. Recent astronomical high-dispersion spectroscopic observations have shown that neutron-capture elements such as Sr, Ba, and Eu have star-to-star scatters in extremely metal-poor stars. However, astrophysical sites and enrichment of these elements are not well understood. In this study, we show the enrichment of heavy elements using high-resolution N-body/smoothed particle hydrodynamics simulations of dwarf galaxies. We find that binary neutron star mergers can contribute to the enrichment of Sr, Ba, and Eu for [Fe/H] >-3 in dwarf galaxies. We also present that supernovae from low-mass progenitors contribute to stars with high [Sr/Ba] ratios. This talk demonstrates that it will be possible to directly compare the results from ongoing star-by-star simulations and Subaru PFS.