The journey of a robot prince begins! The planet Cronos is a world of super-robotic lifeforms, ruled by the wise Master Kirai. But their peaceful existence is shattered by the conquering armies of the Gandora robots. Now, machine combats machine in an epic battle for the planet. Master Kurai's son, Rom, must lead a company of transformable mecha warriors into the fray!

[Source: centralparkmedia]

A ship crewed by earthlings crashes on Chronos. Believing themselves stranded, the crew volunteers to fight along the Machine Robos.

[Source: The Anime Encyclopedia]

When Revenge of Cronos left off, Rom and Leina had crossed a dimensional barrier. Their physical forms changed from robot to human and they were separated with blurred memories. Leina Stol is now incarnated as Leina Haruka, a Japanese schoolgirl. As the story progresses, she meets up with Rod Drill, Blue Jet, Triple Jim, and Rom; all of whom are now human.

[Source: Wikipedia]

The fourth and final OVA of the Leina-centric Machine Robo: Revenge of Chronos spin-off/sequel. Instead of following the story of the previous Wolf Sword Legend continuity, Lightning Trap takes place in another universe.

In present day Tokyo, traveling has never been more comfortable than aboard the Lightning L808, Japan's new luxury passenger plane. One day, on what seemed to be a routine flight, Haruka Leina and the plane's passengers were unaware of the mysterious and top secret cargo brought aboard, which attracted the attention of international terrorists set on obtaining it. Now, with a dangerous hostage situation at hand, only special agent Laika Strange and brave Leina may be able to save the passengers, and keep the deadly cargo from falling into the wrong hands...

[Source: MyAnimeList]

In the future, age is not a factor to determine whether someone can perform a certain task or not, but special talent and training. An organization, Machine Robo Rescue (MRR), was established for robots and children to become partner and rescue people from danger. Then 12 children with various abilities were selected and introduced as part of this program: Robo Rescue!

Meet Oozora Taiyou, one of the children who were chosen as a part of MRR program. After being late on his first day of training, he went to perform a hot rescue with JETROBO. However, a mysterious Robot from mysterious organization, "The Star"(?), appeared before MRR team to interfere with the rescue. What are the motives of the mysterious organization? And what are their goals?

Life as one of the children chosen as part of MRR has started for Oozora Taiyou. Bumpy and hard training is just ahead for MRR team in order to protect many people's life!

[Source: AnimeNfo]