  The chemical abundances of very metal-poor stars provide important
constraints on the nucleosynthesis of the first generation of stars and early
chemical evolution of the Galaxy. We have obtained high-resolution spectra with
the Subaru Telescope for candidates of very metal-poor stars selected with a
large survey of Galactic stars carried out with LAMOST. In this series of
papers, we report on the elemental abundances of about 400 very metal-poor
stars and discuss the kinematics of the sample obtained by combining the radial
velocities measured in this study and recent astrometry obtained with Gaia.
This paper provides an overview of our survey and follow-up program, and
reports radial velocities for the whole sample. We identify seven double-lined
spectroscopic binaries from our high-resolution spectra, for which radial
velocities of the components are reported. We discuss the frequency of such
relatively short-period binaries at very low metallicity.
