A Keio University (one of the top three colleges in Japan) exam candidate, Touma Inaba, is interupted when a cute young girl, Urara Kasuga, arrives at his hotel room door. She later turns out to be his cousin who he barely remembers from his childhood. Urara, who had felt something special for him (an other-than-cousinly-love), invites Touma to live with her since he has no place to stay other than the hotel room. Before taking the test, Touma meets Meiko Yotsuba, a beautiful, sophisticated woman also trying to get into Keio. Meiko gets into Keio but Touma does not, due to a cold Urara had given him shortly before. Although he did not make it, he pretends he does to earn the respect of Meiko. Touma is caught up in a love triangle with Urara and Meiko, while struggling to keep Meiko believing he's really a Keio student and still be there for Urara at the same time. (Source: ANN)

Aoba is a young girl who loves to build models of robots. She lived alone with her grandmother until her grandmother passes away. Shortly after she is kidnapped and brought to a secret base where she discovers a huge robot. The piloted robots fight against Ancient-Jinki in The Grand Savanna, but the true meaning behind the fights is hidden. Aoba works hard at the base so one day she can pilot one of the robots and discover these secrets.

Long ago, the gate to the world of darkness was sealed. Now evil warriors, known as Remnants, are trying to reopen the gate and let demons take over the world. However, at Tobira High School, there exist guardians of the gate who must risk their lives to prevent the gate from being opened.

The Cleopatra Corns Group, aka Cleopatra DC, is a powerful financial conglomerate controlling most of the United States economy, almost as powerful as the US government itself. At the top of the organization is the beautiful, smart and brave Ms. Cleo, the Group's young, talented Chairman. This is good--it means she can handle the repair bill when that airplane crashes into her bedroom. With stolen artifacts, corporate kidnappings, and top-secret cyborg projects gone awry, her luck only gets worse from there.