After leaving the hospital, Sergeant Katsuba, who has bid farewell to frontline service, travels to a provincial town to teach military science to cadets. However, his relationship with the 17-year-old boys does not go well: they consider their instructor to be unfair and overly critical...

Yu-mi applies to a marine outfit to become their first female member. Finding out about their NO woman-policy, she pushes herself to the extreme and fils a petition. After overcoming many obstacles, she is finally accepted for her outstanding performance. However, conflicts never cease between sergeants and Yu-mi, who’s new to the tradition and culture of the marines. Following the sudden death of a trainee, Sergeant HA, she is appointed to the head of the team. Highly motivated Yu-mi loses her troupe's trust after losing IBS. The team is in danger of dissolution due to the loss of a magazine.

This is episode 0, the prequel to the main Keroro Gunsou anime series. KeroZero was shown in theaters with Keroro Gunsou Movie 4.

Behind the scenes documentary on the making of Sergeant York.

A pot dealing man-baby is forced to find a new crib when his roommate/best friend threatens to destroy his teddy bear if he doesn't move out.

Another Kiruru appears in the South Pacific, but it was defeated by two unknown entities that look like Keronians, with subtle differences. Meanwhile, Keroro and the gang goes for a trip sponsored by Momoka to a private island. There, an alien named Meru, who claims himself as the prince of the deep sea, captures them, and aims to make Natsumi his princess, and that they had captured Keroro, who pleads to them to assist the Keroro Platoon, only to be kicked out.

The true story of Leonard Matlovich, a U.S. Air Force sergeant who, in 1975, publicly divulged his homosexuality and fought to remain in service.

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...

The movie begins with Fuyuki Hinata and the Keroro Platoon exploring an abandoned temple in the mountaintop city of Machu Picchu in Peru. While on the exploration, Keroro accidentally sets off a trap, and by chance they find a hidden chamber with a large blue crystal in the center, on a stand that has a key in it. Keroro leans on the key, causing the room to activate a mysterious machine, this caused the entire temple to shake. As soon as the group realized what was happening, they run out of the room. While running, Keroro accidentally loses his Kero Ball while Fuyuki catches a fleeting glimpse of a glowing young woman as he is running out, and tells Keroro that there was a girl in the room, but he is forced to leave the room before he can say anything else. The group successfully escapes, while the girl (now sprouting a pair of glowing wings) watches them leave - while back in the chamber, something is growing within the crystal...

Seeking to unlock the mystery of a strange stone statue that looks exactly like their Sergeant, the members of the Keroro Platoon find themselves engaged in a great adventure.