9S

In the past, there was a scientist who was known as a "mad genius." The amazing inventions he left behind were called "heritage." Countries and organizations are still trying to acquire these "legacies"... But now, the "Sphere Laboratory", a circulating environment facility floating on the sea, has been occupied by an armed group that covets the "legacy" in the facility. The authorities speculated that it would be difficult to suppress the facility, but the last ace they summoned turned out to be a mysterious girl whose entire body was shackled! This girl has a genius mind that is familiar with "heritage" and a beauty that will attract anyone who looks at her. Who is she...? A heroic battle between the finally liberated mysterious girl and the ferocious terrorists is about to begin!