機動戦士ガンダム N-EXTREME•

Kidou Senshi Gundam: N-Extreme

One day, Sai Amagi and Chikage Ebihara are transported to another world by a mysterious woman who wants them to save the world. From the cockpit of the N-Extreme Gundam, these two are surprised by the world they witness. (Source: Kadokawa, translated)