It is a calculator for Japanese numbers.
This can display the calculation process and calculation results in the Japanese numbers.
Can be sent by e-mail.
( If you send by e-mail, depending on the receiving end of the environment, you might Japanese does not appear. )
Setting screen:The gear icon
Full version can be purchased from setting screen in the app.
iPhone X compatible
With Family Sharing set up, up to six family members can use this app.