Starting 8/26 in Gundam Ace October Issue 2017
So is this a isekai or no?
A couple of pages have been posted on the Super Gundam Royale wiki.
https://sガンロワ攻略.gamematome.jp/game/965/wiki/%E3%80%8C%E6%A9%9F%E5%8B%95%E6%88%A6%E5%A3%AB%E3%82%AC%E3%83%B3%E3%83%80%E3%83%A0%20%E3%83%B4%E3%82%A1%E3%83%AB%E3%83%97%E3%83%AB%E3%82%AE%E3%82%B9%E3%80%8D%E9%80%A3%E8%BC%89%E9%96%8B%E5%A7%8B%E3%82%AB%E3%82%A6%E3%83%B3%E3%83%88%E3%83%80%E3%82%A6%E3%83%B3%E4%BC%81%E7%94%BB%20%E7%AC%AC5%E5%BC%BE