PC-98 was popular Japaness hardware platform, which became home for many games, including lots of "dōjin" style dating sims and early games of the Project franchise.
This project is based on sources, published by someone with nickname sawada, who used code of Neko Project II. See project wiki for installation instructions.
The latest version won't work on ARMv7 without NEON support. Unlike Japanese version, F-Droid build additionally supports mips and ARMv6.