Takashi Katori is a big fan of online games, and so is his American friend Sarah. However, one of their RPGs goes too far, as their virtual world and the Lezarion robot that Takashi created for the game somehow mix with reality. Takashi is caught, but later the Earth Governement discovers that an evil scientist from the Moon (now a sort of abandoned colony with restricted access) is hacking into virtual worlds and security, so they force Takashi to pilot the Lezarion and, with Sarah's help, fight evil and protect the Earth.

Daicon III Opening Animation An unnamed girl watches as the Science Patrol lands their aircraft. A masked individual exits the ship and approaches the girl, entrusting her with a cup of water and a simple task: to water a radish. The girl enthusiastically accepts her mission but is obstructed by a multitude of foes. Faced with waves of unrelenting monsters, mechas, and starfighters, can the young heroine protect the cup of water and make it to the radish unharmed? Daicon IV Opening Animation Clad in a Playboy Bunny suit, an older version of the same girl takes on new and notable adversaries from around the galaxy. From dueling with lightsabers to surfing the magical sword Stormbringer, there is no shortage of action! Set to Electric Light Orchestra's "Twilight," the Daicon IV Opening Animation is a grand tribute to science fiction culture, showcasing hundreds of familiar characters in one spectacular bout.

A gigantic meteorite landed on earth a few years back. A mysterious capsule believed to have belonged to the aliens was discovered. Called the "black box," an international organization called "Project BB" was created to research it. Eight boys, including Manabu Yoshimura, attend International Academy, a school located near Project BB headquarters. They are enticed by their teacher Toukichi Hashiba's promise of "I'll give you class credit," and end up getting involved in his experiment. The experiment was to enter the eight empty chambers of meteorite. According to Hashiba's theory, the meteorite should strongly respond to strong human thoughts. He tells them to have a clear image of a great looking gigantic robot; if they do, something should happen... Then, a big spaceship appears in the sky and an alien calling himself Wercury appears in a 3-D image. He tells them he is from the Star of Prokimasi and that he has come to collect the meteorite of the Choshin people. If they do not hand it over, he will challenge the earth beings to a battle. Manabu and his friends are confused by the unexpected turn of events but the meteorite responds to the thoughts of the group and suddenly starts to transform itself into a gigantic robot. Then, attacked by the invading Prokimasi robot, they are forced to pull their strength together and fight back. But it is extremely difficult to put the wills of the eight together as one and the robot cannot fight in the way it should. The gigantic robot that Hashiba named "Gakusaver" and Manabu's eight; can they manage to protect Earth and the meteorite from the Prokimasi invasion?

The science lessons are short "omake" bonus features originally present on the first two volumes. Each short lasts around two minutes, and stars super deformed versions of Noriko, Kazumi and the Coach explaining the various scientific aspects of the series.