In the original storyline as aired in Japan, Dairugger XV was simply an exploration robot, as well as an intended peace-keeping force. The Earth is in a time of prosperity. The president of the Terran League (the "Galaxy Alliance" in Voltron) launches a mission to explore beyond the galaxy. After commencing its mission of exploration, the starship Rugger-Guard is attacked by a ship of the Galbeston Empire. Dairugger, the super robot, is deployed in order to defend the Earth. It is somewhat by fate that they must help the people of Galbeston find a new planet before it explodes, and liberate it from its despotic Emperor. In the Japanese version, it does not have anything to do with King of the Beasts GoLion, as opposed to the U.S. version, Voltron: Defender of the Universe. There are three assault team units: Land, Air, and Sea. There are a total of 15 parts referred to as "Rugger," which can combine together to form the super-robot Dairugger. The design of the 15 separate Rugger units came from the sport of rugby, since 15 players are required to form a rugby union. The U.S. version would rename the "Galbeston Empire" to "Drule Empire," along with editing a fair amount of violence and sexual content to keep the show safe for general audience broadcast.

Extra anime shorts included on DVD. Episode 1: Summer Memories (Vol. 1) Episode 2: The Meteor Distance (Vol. 3) Episode 3: Twinkle Star (Vol. 5) Note: Music video specials are not included in the entry as they don't contain any new scenes.

Today, the imperial court is soliciting traversals, giving them various positions according to their talents, changing the civilization after the fall, and trying to create a new world. Zuo Yunqi is just an ordinary young master, mixed with the court in disguise as a spy to save his father. However, he was recognized by one hired specifically to spot such spies, and the two engaged in an epic battle of wits. When the two jointly prevented a terrifying conspiracy, they found that the traversals secretly established an alliance to try to overthrow those in power and build a new society of peaceful coexistence. Zuo Yunqi and his party were forced to participate in this battle.

In a certain distant land, home to numerous intriguing towns and people, many wondrous sights can be found. Traveler Tortov Roddle encounters a curious patch of red berries and after sampling one, happily indulges himself with more. He soon realizes, however, that this delectable fruit has considerable hallucinogenic effects and finds himself partaking in his greatest trip of all. Elsewhere, a little girl finds brief yet fantastical escapes from her everyday life. In yet another city, residents are baffled when giant black apples begin raining down from the sky, but find that they may have use for them. A journey into the extraordinary, Aru Tabibito no Nikki Specials explores the surreal occurrences of its setting, and how the land's inhabitants react to certain dreamlike experiences they encounter.