Yes, Chikuwa Diary is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
Chikuwa Diary has several in-app purchases/subscriptions, the average in-app price is CHF 3.25.
To get estimated revenue of Chikuwa Diary app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.