Die fünfte Skizze weist die Schwestern in Richtung einer Wüste in Libyen. Dort entdecken sie die sechste Skizze. Das Entziffern dieser Skizze sollte das Mysterium hinter der Natur des Galileo Tesoro lüften — aber plötzlich greift ein Feind Grande Rosse.
At the Lybian desert, the sisters find the sixth and final sketch, when Roberto appears to ambush them. However, the Galileo's fuel is depleted and they are unable to escape. Roberto demands the sisters to surrender all the sketches along the Galileo Tesoro, claiming that the one he obtained from them previously was a fake, and in the occasion, Anna reveals herself to be working under him and that she was the one who emptied the Galileo's fuel tank. However, when the Black Ganymede appears to rescue the girls, Anna betrays Roberto and reveals that the fuel was not thrown away, but stored inside the ship and urges the sisters to escape. However, both the pirates and the sisters are about to be killed when Hozuki activates the real Galileo Tesoro and time slows down arround her, before she is thrown into the past, centures before, where she has an encounter with a youngster, who is in fact her ancestor Galileo Galilei himself. After having his prototype flying machine destroyed by accident, Galilei realizes that Hozuki has fallen from the same kind of storm and shows her some other strange objects that fell from it. Hozuki then figures that those items were sucked by the Galileo Tesoro when she activated it in Russia. After Galilei reveals that the storm occurs in regular intervals, he and Hozuki join forces to create an airplane in time for the next storm and return her to her proper time.
５枚目のスケッチが指し示したのはリビアの砂漠。そこで６枚のスケッチが揃った。これを解読すれば、ガリレオテゾロが解明できる！そう思った瞬間、グランデロッソが敵襲を告げる。
En este interesante episodio las hermanas se enterarán de la verdadera identidad de Anna. Por otro lado, enfrentarán un fuerte ataque y Hozuki terminará de forma repentina en un desconocido lugar. Allí conocerá a alguien sumamente importante.
