Keroro Gunsou Movie 4: Gekishin Dragon Warriors de Arimasu!

Enormous structures known as Dragon Tails suddenly appear across the globe, prompting Keroro Platoon to split up and investigate. Their mission takes a troubling turn when Tamama vanishes, and the search eventually leads Keroro and the others to Mont-Saint-Michel in France.

There they meet Sion, a mysterious girl connected to an ancient Dragon Book and to the strange phenomena spreading around the world. As the secrets surrounding the book begin to surface, the platoon is drawn into a crisis far larger than another failed invasion plan, one that could transform their own powers and place the entire planet in danger.