S1.E1 ∙ Chapter 1: The Tsundere, the Prince, and the Voices of the Gods

The year is now 2041 AD. A new enemy called Zeravire suddenly appears in the solar system, destroying all military installations it comes across. However, a wealthy man named Klein Sandman is already aware of this planned invasion and had been secretly preparing his army for battle. His trump card is Gravion, a giant robot that utilizes gravity as its source of energy. Meanwhile a young man named Eiji secretly enters Sandman's base in search for his missing sister. It is there that he meets another young man by the name of Toga... These two must now fight together with four other individuals aboard the super robot, Gravion to fend off the Zeravire threat.

Saved by Merlin, a wise magician, and brought up by a retired knight. When he was 1 5 years old, he happens to prove that he is the person to be the king of all Britain, by drawing out the sacred sword, Excalibur, which no other men was succeeded to draw out from the iron stand. But in order to become a real king, he has to beat Lavic who is under the protection of Medessa, an evil witch. Merlin tells Arthur that he has to find out the Holy Shield to bend King Lavic and Medessa. Thus, Arthur goes on a journey to seek the Holy Shield. On the way he runs into four boy knights-Lancelot, Perceval, Tristan and Guerrehet, who hold up the same ideals as he does. They make a pilgrimage from one country to another in search for the Holy Shield, helping some common people who are distressed by bad aristocrats under the influence of Lavic, and subjugating some bandits.

Yui is an average schoolgirl who lives in a future where all computers are supported by a single global network known as COMNET. Yui is a computer-illiterate girl who after a computer-lab accident is approached by IR, a raccoon looking corrector computer program, which tells her she must save COMNET. She must stop the rogue A.I. (Artificial Intelligence) computer program known as Grosser and his hench-programs from taking over the world. Grosser was originally designed to be that manager of all of COMNET. At first she's very reluctant to play the heroine because of her complete lack of knowledge and ability with computers. To save COMNET she must find and gain the trust of the other seven wayward corrector programs. They must also find the creator of COMNET Professor Inukai, to help stop Grosser for good.

After a young girl's mother dies she is moved from the city to the country where she accidentally meets a synthetic alien 'Figure' that takes the guise of a twin sister and begins attending school with her.

Five portals to different parallel worlds suddenly appear. Each must fight for survival with the key being the card device that can capture the invading Z/X creatures from the other worlds.