Answer
According to the current store listing, the core of the game can be played offline. A connection may be needed from time to time for installation, purchase verification, updates or certain platform features. So not every action, from the first download to restoring a purchase, works permanently without a network.
When changing devices, your progress depends on which local backup or store function the current version supports. Before uninstalling, users should check the relevant notes. For support, the app version, the Android version and the exact point at which a connection is requested or a saved game cannot be found are important.
As of 3 September 2026
Further reading
Related topic: OshiYa