Here is the current official mobile landscape:
was never officially released as a standalone APK for Android by the developer, NEKO WORKs. The official Nekopara series (including Vol. 0) is primarily available on PC (Steam) and console platforms. Any “Nekopara Vol. 0 APK” found on third-party websites is likely unauthorized, pirated, or a fan-made port and may pose security risks (malware, data theft, etc.).
These are typically found on the Google Play Store rather than as standalone unofficial APKs.
Legal, safe, supports the developers, full game features. Cons: Requires a PC and good internet connection.
: The game files typically require around 337 MB of space.
This popular Android emulator can run many visual novels based on the KiriKiri engine.