Dr. Kazuki, who perceived of an invasion of Earth by the Izaru people builds a robot based on the science of magnetism and sphere joint theory. Undergoing a dangerous augmentation process, Dr. Kazuki's daughter Mai becomes the pilot of Mighty or Magnetman Minus. Takeshi Houjou becomes the pilot of Puraiza or Magnetman Plus. The pilots would hold each other and then physically trasform their joint bodies in a metallic plate locking itself on the Gakeen (Short for Gathering Keen) robot's frame thus enabling the super robot to move and fight. This sequence was notable, to an adult's eye, for its almost-sexual connotation. (Source: Wikipedia)

Set in the year 2052, Earth has managed to find peace until the arrival of the Death Force - ruthless aliens from a dying solar system - who are desperately searching for a new home. Attacking the Earth with a massive satellite ship called Terror Star, the aliens proceed to terraform the planet to make it their own. For mankind there is one hope: it's up to Colin Collins and a small band of his fellow surviving students to crew a top-secret submersible vessel that can fight the invaders at sea or in space.

It has been three years since the end of the series. Ryo works for NASA as an engineer on a large rocket project. Anise, fellow Borgman and lover, has been reduced to flipping burgers in a restaurant. So naturally, when she gets a letter offering her a professional job in a big, Japanese, high-tech project, she jumps at the chance. Ryo, however, is as indecisive as ever and so she leaves for Japan without him. Chuck Sweager, the third Borgman, is a police officer, as is his girlfriend Miki. When she witnesses a fight amongst several cyborgs she tells Chuck, who says flatly that it cannot be possible, since the only living cyborgs are Ryo, Anise, and himself. But she convinces him and they investigate. Anise arrives for her new job, and when they meet for dinner they explain the situation to her. Anise volunteers to sneak around the Heaven's Gate project, which they believe to be the source of these new cyborgs. Ryo, meanwhile, is en route to Japan to go after his girlfriend. Accompanying him is Hussan, one of the two surviving researchers on the Borgman Project, who has been asked to appear before the Tokyo Police to help investigate. Once the entire cast is in Japan, things begin to get complicated. (Source: ex.org)

The anime will take place not in space (uchuu), but in Puchuu, and will feature the first Puchuu tour in PriPara history. The PriPara idols will tour the solar system and will discover new wonders. Various trials await the idols, and things aren't straight forward. Will the idols be able to make it back to Earth safely? (Source: ANN)