In 2039, helper androids are widespread as general purpose electronics. Keiichiro lost his family in a traffic accident and retired from his band. One day, he finds an android of an old model in a garbage dump. He takes her home, but after taking her to a repair shop he was told that she couldn't be repaired, so he plans to throw her away. The next day, Keiichiro finds her making breakfast for him. Thus begin the summer days of an android with no memories and a dreamless boy.

During the dawn of the 21st century, the United Nations Kurobe Research Institute was established in Japan to investigate an ancient artifact, which was discovered during the construction of the Kurobe Dam. Scientists from around the world have gathered in the facility to study the object, while their children enjoy their everyday lives attending Mt. Tate International Senior High School. Yukina Shirahane, a reserved high school girl, is the daughter of the facility's head scientist. While visiting her mother at the facility, Yukina manages to solve part of the artifact's puzzle. To her surprise, what appears before her is Kennosuke Tokisada Ouma, a young samurai from the Sengoku era. As a threat approaches from outer space, Yukina, along with Kennosuke, finds herself defending Earth against the invading forces. Along the way, she discovers the mystery behind Kennosuke and the reason he is determined to protect her. [Written by MAL Rewrite]

12,000 years after the events in Genesis Aquarion, humans live on the star Vega under constant threat of trans-dimensional beings called Abductors. These enemies originate from Vega’s sister star Altair and raid Vega for human life. As a countermeasure, an organization known as Neo-DEAVA formed to combat the Abductors. They pilot advanced mecha suits called Aquaria and are strictly separated by gender. Boys and girls are not allowed contact; they are even restrained from fighting on the same battlefield. However, events take a shocking turn when an advanced Abductor mecha suit joins the fray. Two teenagers, Mikono and Amata, are dragged into the conflict. Unknowingly, Amata performs a taboo when he summons an Aquaria and initializes what is called the Forbidden Union between male and female Aquaria. Neo-DEAVA is shocked, and the repercussions of Amata’s actions are much farther reaching than he realizes. How was he able to summon an Aquaria? Where did he learn to form a Forbidden Union? And why was Mikono also able to pilot the mecha suit?

This episode takes place before the actual planning of the School Fair and shows how the girls spend their summer holidays.