Since this is an adult-themed visual novel, it is not available on the Google Play Store. You should download it from official developer channels or trusted community forums to avoid malware:
If you are updating from a previous version, newer releases (like Release 5 or 6) are typically save compatible with older ones, but it is always recommended to back up your save files first.
Download the file from your chosen source.
This is the safest way to get the latest builds (e.g., Release 6 v0.36.1) and support the creator, Henissart .
Android devices block installations from outside the Play Store by default. To install the APK: Open on your Android device. Go to Apps or Security/Privacy . Look for Special App Access or Install Unknown Apps .