This is a popular visual novel by creator rausmutt , which is often distributed as a compressed archive (like .zip or .rar) containing the game's executable and assets.
: The latest public version (v.47) is typically around 470 MB and is available on Itch.io for PC, Mac, and Android. Sheltered.rar
: This tool is frequently used to manage "sheltered" apps in a sandbox environment and can be found on F-Droid . Which "Shelter" This is a popular visual novel by creator