No English
This would be good if it was in English.
Yes, 晴空学院 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
晴空学院 is free.
To get estimated revenue of 晴空学院 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
This would be good if it was in English.