"Galilei Donna" is an 11-episode anime series set in a future where climate change has drastically altered the world, leading to rising sea levels and a scarcity of resources. The story centers on the three Ferrari sisters—Hozuki, Hazuki, and Kazuki—descendants of the famed Italian astronomer Galileo Galilei. Each sister possesses a unique personality and skill set, which becomes crucial as they are thrust into a global conflict over a mysterious artifact tied to their ancestor.

The narrative begins when Hozuki, the youngest sister and an aspiring inventor, discovers a small, fish-shaped device called the Galileo Tesoro. This artifact is believed to hold the key to immense power, and its existence attracts the attention of powerful organizations, including the Adni Moon, a corporation with a monopoly on lunar resources, and the anti-corporation resistance group, the Galilei Mafia. The sisters are forced to flee their home after an attack by the Adni Moon, setting off on a journey to uncover the truth behind the Galileo Tesoro and its connection to their family legacy.

Hozuki, the protagonist, is a determined and resourceful inventor who often relies on her creativity to solve problems. Hazuki, the eldest, is a pragmatic lawyer who initially struggles to reconcile her logical mindset with the fantastical events unfolding around her. Kazuki, the middle sister, is a skilled pilot with a carefree attitude, providing both comic relief and technical expertise. Together, they navigate a world of airships, advanced technology, and political intrigue, encountering allies and adversaries along the way.

As the sisters delve deeper into the mystery, they uncover secrets about Galileo Galilei’s life and his involvement with the Galileo Tesoro. The artifact is revealed to be part of a larger plan to restore Earth’s environment, but its power also makes it a target for those seeking to exploit it for personal gain. The series explores themes of family, legacy, and the ethical implications of scientific discovery, all while maintaining a fast-paced, action-driven plot.

The story culminates in a climactic confrontation between the sisters, the Adni Moon, and the Galilei Mafia, with the fate of the world hanging in the balance. Through their journey, the Ferrari sisters grow closer, learning to rely on each other’s strengths and embracing their shared heritage as descendants of one of history’s greatest minds. The series concludes with a resolution that ties together the personal and global stakes, leaving the sisters to face an uncertain but hopeful future.