About langage for nitro phone2

Hello,
I got a nitro phone2 today.
I’m a Japanese.
The system can be displayed in Japanese.
However I can type only Alphabet.
Is there any solutions?
And I don’t know how to install google play.
Please advice for me.

For Google Play Have a Look here
https://docs.nitrokey.com/nitrophone/apps.html

This might also work

Your answer is precisely.
I solved the problem.
Thank you.