Tells the story of a member of the Universal Peace Corps from the Planet Radion coming to Earth on a mission to determine if this world meets standards for membership in the Galactic Union of Worlds and assist its inhabitants during his stay. While on his mission Prince Planet adopts the identity of an Earth boy named Bobby and gains comrades who work together alongside him combating evil forces both alien and terrestrial.

When aliens plan to invade earth, the young Kouta along with a giant robot from outspace named Exkaiser must team up to save the world and his friends.

Far to the north of the world lies Hell's Gate, a portal formerly used by the Demon Lord to invade the human realm. Thanks to the legendary hero Shion Bladearts, wielder of Excalibur, and his loyal band of companions, the Gate was sealed off and the demonic threat was vanquished. Unfortunately, the seal was incomplete and has begun to weaken, allowing the demons to once again begin their attack. Worried about the safety of his village, selfish and perverted farmer Touka Scott dig pitfalls to defend against the demons. But fear not, for Shion is on his way to reseal Hell's Gate and save humanity! Or at least he was, because the legendary hero is dead, having fallen into one of the pitfalls Touka dug. Luckily, dealing with the dead is the specialty of necromancer Anri Haynesworth. While she can't revive him, Anri can at least salvage their quest by forcing Touka's soul into Shion's rotting body and dragging him along to Hell's Gate in Shion's place. Not wanting to be left behind, Touka's childhood friend Yuna Yunis tags along. Together, the three of them set out as what just might be the most unsuitable party to ever try to save the world!

Far to the north of the world lies Hell's Gate, a portal formerly used by the Demon Lord to invade the human realm. Thanks to the legendary hero Shion Bladearts, wielder of Excalibur, and his loyal band of companions, the Gate was sealed off and the demonic threat was vanquished. Unfortunately, the seal was incomplete and has begun to weaken, allowing the demons to once again begin their attack. Worried about the safety of his village, selfish and perverted farmer Touka Scott dig pitfalls to defend against the demons. But fear not, for Shion is on his way to reseal Hell's Gate and save humanity! Or at least he was, because the legendary hero is dead, having fallen into one of the pitfalls Touka dug. Luckily, dealing with the dead is the specialty of necromancer Anri Haynesworth. While she can't revive him, Anri can at least salvage their quest by forcing Touka's soul into Shion's rotting body and dragging him along to Hell's Gate in Shion's place. Not wanting to be left behind, Touka's childhood friend Yuna Yunis tags along. Together, the three of them set out as what just might be the most unsuitable party to ever try to save the world!

Grade schooler Yuuta Tominaga stumbles upon Deckerd, a humanoid robot under construction by the Japanese police, built to fight advanced forms of crime. Yuuta's constant contact with Deckerd gives the robot a "heart," or personality; when Yuuta is recruited as the "boss" of the "Brave Police" as a result, a true human/robot partnership occurs.

Unaired episode that was released with volume 9 of the Light Novel.

Specials included in the Blu-ray/DVD Volumes.

Beast Tamer Rein, who uses animals, was a member of the hero's party. However, since he couldn't do anything else, he wasn't able to keep up in battle. "You only know how to play with animals. You're fired." Rein is kicked out of the party and now lives freely as an adventurer. On his journey, he meets a girl from a cat tribe, the so-called strongest species. Elsewhere, the hero's party remains unaware that their previous success was all thanks to Rein... This is the story of a beast tamer no longer held back and his fateful encounter with a precious companion.

Beast Tamer Rein, who uses animals, was a member of the hero's party. However, since he couldn't do anything else, he wasn't able to keep up in battle. "You only know how to play with animals. You're fired." Rein is kicked out of the party and now lives freely as an adventurer. On his journey, he meets a girl from a cat tribe, the so-called strongest species. Elsewhere, the hero's party remains unaware that their previous success was all thanks to Rein... This is the story of a beast tamer no longer held back and his fateful encounter with a precious companion.

After a slumber of 12 millennia, the Demon Empire returns to seize control of the Earth. Reideen, the giant robot-like protector of the lost continent of Mu, senses the evil presence and awakens within its golden pyramid, revealing to young Japanese boy Akira Hibiki that he is the one descendant of the ancient Mu people who must help Reideen save Earth. He was assisted by his friends, token girl Mari Sakurano (daughter of a scientist fighting the Demon Empire) and several members of his high school soccer team.

A huge space monster appeared in a city and began to destroy the city. People were escaping with screaming. Among them, there were five high school students, En, Kai, Shin, Yoku, and Ryu. However, they failed to escape, and they rushed into a patrol car parked nearby. The monster was approaching to them. When they began to accept their death, the patrol car glowed blue white and disappeared into a mysterious space carrying them. When they were astonished, it was an alien that appeared in front of them. He was a Bravian who is an officer of the Space Police Organization that was responsible for the peace and order of the universe. He explained them that he was aimed at by ferocious aliens in the Space Prison Sargasso. He added that he had given them a battle machine "Dag Beagle" made by copying machines on the Earth in order to fight against Sargasso. They turned into Dagwon by the power of Bravian, and fought against space monsters. At that moment, the patrol car came in front of En. En grew into the car and turned into the Brave Robot Dag Fire, then beaten the enemy. However, the fight between the Brave Dagwon and the felonious aliens of Sargasso had just begun.

A Continuation of the original Dagwon Series. Peace is restored and the original cast return to their normal life. The sudden appearance of a new mysterious boy that appeared and was chase by no other than their own ally from the past demanding the Dagwon crew to turn the boy in. The dead from the past also make an appearance in this OVA. So the new adventure and excitement begin a new.