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The third season doesn`t have a particular story behind everything (like "Valkyrie Ghost" in the second season). It just tells 6 stories about the life of Kazuto & Co. with some additions: Raine and Chorus get a house on earth, the last three Valhalla princesses each get an episode, and in the last episode Kazuto and Valkyrie, who in the same episode managed to stay adult, >try< to marry again. (Source: ANN)

A 45-minute recap episode of the first season, narrated by Sanada-san.

Duke Fleed is a survivor of the Fleed Planet who is escaped to the Earth, onboard a mysterious "spaceship", where is raised by Dr. Umon as his adoptive son, and known as Daisuke Umon. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his younger sister Maria Grace), Duke decides to fight back using his best weapon - the almighty Grendizer.

Ray, Anna, Tyler, Halle, and Eisuke are five high school students who are suddenly wrapped up in a mysterious incident. An alien species called Grey abducts Halle's sister and embeds her with a special chip inside her brain. The five stand up to save Halle's sister and try to reveal the existence of aliens, but continue to be met with mysterious events. The high school students' story progresses into a shocking development! What truths hide on the dark side of the moon? What are the true intentions of the aliens that are infiltrating America, Russia, and China? What is the true crisis that is closing in on Earth and what hope can we have towards the future!? (Source: HS Pictures Studio)