Kuutei Senki is set in a world composed of floating islands, oppressive kingdoms and the air pirates that fight against them. The player gets to choose one of four different factions and follow that faction's story to the end. Along the way, we meet allies, enemies, and interesting rivals that make the journey easier or slightly more challenging. To top things off, the game also features a board game-based battle system that pits airships against each other, with mission objectives that must be fulfilled in order to move on.

We have four different pirate factions to choose from in KuuSen, each with a peculiar main cast. To start we have the crew of the Giltinia, that being Gaven, Anastasia and Shade. The player takes the role of Gaven. Our protagonist awakes after what seems to be a long sleep with no memory of his past. The only clues to who he is are revealed by a bandaged man named Shade. Along for the ride comes a cute little bat/cat thing named Anastasia, though Gaven and Shade decide to call her Nasta.

[From Moroboshi Yuumei review]