Sagaia follows the story of Proco Jr. and Tiat Young as they receive a mysterious radio broadcast from another descendant of Darius, leading them on a quest to defeat an evil force and save the galaxy.
The gameplay in Sagaia takes place in a non-linear level system, where players must navigate through various levels while avoiding enemies. The twist is that these enemies are all different types of seafood, adding a unique twist to the traditional shoot 'em up genre.