Do you want to learn Japanese?
This app is kind of a flash card with reading.
You can learn the basic Japanese character (shape and reading) from sample card sets in this app.
You can make your own cards easily.
Copy words or sentence, etc... from your textbook.
This app is designed not only for Japanese.
It has a variety of uses by your idea.
Its restricted the uses during 00:00 to 07:00.
For unlocking this limitation, consider to purchase add-on item.