Rista Mechaniti spends her days peacefully inventing in a small town.
One day, this world was suddenly lost to a robot rampage.
With the help of her old friend Kuri, Lista decides to investigate the cause of the town's accident.
Then a girl named Fresero shows up.
What's more, she seems to know Rista for some reason.
During the attack of the giant robot HENTAI, which is skillfully manipulated by Fresero,
Lista struggled to find out the truth. What is Fresero's true purpose?