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Hyper-Kamiokande will be a next generation underground water Cherenkovdetector with a total (fiducial) mass of 0.99 (0.56) million metric tons,approximately 20 (25) times larger than that of Super-Kamiokande. One of themain goals of Hyper-Kamiokande is the study of $CP$ asymmetry in the leptonsector using accelerator neutrino and anti-neutrino beams.  In this document, the physics potential of a long baseline neutrinoexperiment using the Hyper-Kamiokande detector and a neutrino beam from theJ-PARC proton synchrotron is presented. The analysis has been updated from theprevious Letter of Intent [K. Abe et al., arXiv:1109.3262 [hep-ex]], based onthe experience gained from the ongoing T2K experiment. With a total exposure of7.5 MW $\times$ 10$^7$ sec integrated proton beam power (corresponding to$1.56\times10^{22}$ protons on target with a 30 GeV proton beam) to a$2.5$-degree off-axis neutrino beam produced by the J-PARC proton synchrotron,it is expected that the $CP$ phase $\delta_{CP}$ can be determined to betterthan 19 degrees for all possible values of $\delta_{CP}$, and $CP$ violationcan be established with a statistical significance of more than $3\,\sigma$($5\,\sigma$) for $76%$ ($58%$) of the $\delta_{CP}$ parameter space.

A Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande