Ninja Gaiden 2 xbox one?

Un
- in Xbox
1

Does anyone know how to get Ninja Gaiden 2 for the xbox one? In the store you can only see it and not buy it, and I don't find any keys on the Internet either (whether I want to buy it now on the xbox in the store or on the Internet at Microsoft, the message is always not available in my region) Or you can also activate the game with the xbox 360 Ninja gaiden 2 disk?

Ma

I'm sorry but I don't see any Ninja Gaiden 2 in the store.

Maybe it is not backwards compatible and therefore not buy or even visible?