In the middle of the 19th century, Japan was still closed off from the outside world. There were just the beginning signs of reformation in the long regime of Shogun Tokugawa. In the remote countryside, on the island of Shikoko, a young boy named Ryoma is growing up in a lower-class Samurai family. A decade later, he is to become on of the leading figures to topple the Shogun's reign and open Japan to the western world. Our story begins with Ryoma, a dreaming kid of seven years. Ryoma is an honest and tenderd-hearted boy who hates any sort of violence and brutality. He is so sensitive, and a bit naive, that he often cries from pity when he sees even the simples act of violence such as another kid trampling a tiny insect. The kids and even his family call him a "cry baby". However, he is not a coward -- not a "chicken" at all. His distress comes from a desire to prevent unreasonable acts and the wrong doings in life. His older sister is the only person who understands his depth. She recognizes that her brother is gifted with a special talent and she does her best to protect him and cheer him up.

Short specials from the DVDs.

Marika Katou, a third year student at Hakuho Girls' Academy, is a legitimate space pirate with a Letter of Marque. Between her studies, leading her school's space yacht club, working part time at Cafe Lamp, and being the captain of the space pirate ship Bentenmaru, Marika's days are very busy. One day, Marika gets a job to rob a high-class passenger ship, and she discovers that on the passenger list is Kanata Mugen, a boy who owns a "galaxy pass". Thus, an adventure featuring a hyperspace race between pirates and one young boy begins.

Alien invaders take over Great Mazinger who is at the entrance of a museum next to Mazinger Z as symbols of peace. Grendizer fights the evil invaders and Great Mazinger is recovered. 

When the Vegan empire dispatches a new general to oversee the takeover of Earth, he quickly manages to capture Koji Kabuto and, learning of Great Mazinger through interrogation, quickly commandeers it from a museum where it was kept as a symbol of peace. 

It is now up to Duke Fleed aboard Grendizer to stop humanity's former defender from becoming its destroyer.

(Source: ANN)