Yes, ISEKAI: Demon Waifu may collect personal data as outlined in its privacy policy, which includes information necessary for account management and gameplay enhancements.

Yes, ISEKAI: Demon Waifu can be played offline, although certain features, like updates and online events, may require an internet connection.

You can cancel your subscription through the app store settings on your device, where you manage your subscriptions, or directly within the app's account settings.

The subscription costs vary depending on the chosen plan, with options for monthly, quarterly, or yearly subscriptions, typically ranging from a few dollars to a higher tier for premium access.