Major Nelson has taken to Twitter today and revealed that three more games are now backward compatible on Xbox One. These games in particular have only been published in Japan.
Steins;Gate: Hiyoku Renri no Darling
Steins;Gate: Senkei Kousoku no Phenogram (disc only version)
You’ll either need to buy a disc version from the internet, or own a Japanese account with Japanese currency to purchase them via digital format.
— Larry Hryb 💬 (@majornelson) May 18, 2017