https://ginga-force.fandom.com/wiki/Natsuki_Chronicles
Natsuki Chronicles (ナツキクロニクル Natsuki Kuronikuru) is a shoot'em up game developed by Qute Corporation in 2015 and finally released on December 25th, 2019 on the XBOX One after a 4-year delay on its development. It is a prequel and in-betweener of Ginga Force as the game events take place from before to during those of Ginga Force.
The game takes place 3 years before the boss battle with Natsuki Sugiura and the Garm in Ginga Force. Starting from Natsuki's first mission with the RDF as the new rookie in the team up to the confrontation with Alex and Margaret, now seen from Natsuki's point of view. After her defeat, she realizes the truth of Magni Company, the MSS and the RDF and makes a decision of going against them in order to save Seven Tier.