Keroro Gunso the Super Movie 4: Gekishin Dragon Warriors (超劇場版ケロロ軍曹 撃侵ドラゴンウォリアーズであります!, Chō Gekijō-ban Keroro Gunsō: Gekishin Doragon Woriāzu de arimasu!) is a 2009 Japanese animated comic science fantasy film directed by Susumu Yamaguchi. It is the fourth film installment in the Sgt. Frog series created by Mine Yoshizaki. The film was released on March 7, 2009, in Japanese theatres and later got released to DVD on July 24, 2009, in Japan.
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Plot
Mysterious giant dragon-like creatures called "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.
Reception
During its first week, Keroro Gunso the Super Movie 4: Gekishin Dragon Warriors was placed 5th at the Japanese box office.