توضیحات:

Each time you hit a number from 0 to 9 or a calculation symbol, the ninja will fly, shake the sword, run, jump slash, and the ninja will dance.

Of course, the calculator function is fine.
Because it is a calculator ...

Any ninja action can be set from the setting screen.
Find the ideal ninja action with the button layout that suits you.

This calculator is recommended for those who are tired of a calculator with only ordinary calculations.

When the ninja is in the way, use the silent button ...
It disappears with ninja.
If you feel lonely, press again to show up.

It is also possible to make a lot of ninjas appear by alternation techniques with a little trick.
Please find the trick.