That's the JP version page. I see this message on the right where the download button should be:

You are not eligible to purchase this app due to geographical restrictions.

It also doesn't show up on my search results.

Here's the NA version: https://www.amazon.com/Puzzle-Dragons-Kindle-Tablet-Edition/dp/B00KPTKW8G/

Still 9.1.0.

The name of the app is "Puzzle & Dragons (Kindle Tablet Edition)"

https://www.amazon.com/Puzzle-Dragons-Kindle-Tablet-Edition/dp/B00KPTKW8G/ref=pd_rhf_gw_p_img_5?_encoding=UTF8&psc=1&refRID=8G3F9H1QNQ8QE63CNC7C

You can't even install in on the Amazon Fire phones.

That's the JP version page. I see this message on the right where the download button should be:

You are not eligible to purchase this app due to geographical restrictions.

Here's the NA version: https://www.amazon.com/Puzzle-Dragons-Kindle-Tablet-Edition/dp/B00KPTKW8G/

Still 9.1.0.