Akira Sato is an Advancer, a professional explorer of uncharted and dangerous worlds scouted for human colonization. His past is marked by a severe setback: he was robbed of his money and spaceship while on Space Station M-75, an event that left him stranded and fighting for survival in the station's lawless environment. His fortunes shift when he saves fellow Advancer Tina Owens, leading him to join her and a girl named Frill on their mission to investigate the lethal planet known as Omega 13.

He is a well-built, muscular man with dark brown hair and brown eyes. His skills include high proficiency with an array of weapons, from firearms to bladed and stabbing instruments, and his exceptional combat abilities and physical conditioning are significant assets.

He operates as the Lancer within the group dynamic, a supporting character who provides direct aid to the central protagonist, Tina Owens, on her mission.