Thank you very much for your advice. I tried multiple combinations.
I understand followings
Scroll-bar is supported on Adobe Reader on Windows, not on iOS
Scroll-bar appears when text size is fixed and "Scroll long text" is set
On the other hand, if I set western font on the box, e.g., Arial, Helvetica, even Japanese texts do not overflow on iOS, but this is not the case on Windows, texts are not shown at all. I attach 2 images below.
1st row; Arial, Helvetica, both auto size+scroll long text
2nd row; Japanese font fixed size + "Scroll long text", Japanese font fixed size without "Scroll long text"
3rd row; Japanese font auto size + "Scroll long text", Japanese font auto size without "Scroll long text"
It looks like there are some differences on handling Japanese texts by Adobe Reader between iOS version and Windows version. I am going to try more combination.
Thank you again for your advices
iOS
Windows