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A forest full of animated animals encourage a pair of snails, who are fully clad in black because they are in mourning for a dead leaf, to celebrate the new spring and reclaim the colors of life. Based on the children's poem by Jacques Prévert entitled "Chanson des escargots qui font à l'enterrement" ("Song of the snails who are on their way to a funeral").

Mysterious giant beings called "Ryū no Shippo" (Dragon Tails) appeared across the world. Due to the danger it could bring, the Keroro Platoon did a worldwide research on the Dragon Tails, but Tamama suddenly disappeared during the research. Because of this, the whole platoon started their search for Tamama and ended up in Mont-Saint-Michel, France where they met mysterious girl named Sion, who holds the mysterious Ryū no Hon (Dragon Book). But little they know about the secrets about her and the worldwide calamity that would destroy the entire world, as they know it...