Yes, 私語-暗号文伴侶、親友の私的交流を実現する良い助手 is free to download, however it contains in-app purchases or subscription offerings.
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私語-暗号文伴侶、親友の私的交流を実現する良い助手 has several in-app purchases/subscriptions, the average in-app price is ¥100.00.
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