Fumi Manjoume and Akira Okudaria were close friends when they were young, but when Fumi moved away, they lost contact. Ten years later, they meet again as high school freshmen. Although they find that things between them have changed, they try to help each other through hard times, and maintaining the new lives they’ve built without growing apart.

The story is set in a village in the southern Japanese prefecture of Kōchi during World War II. Even in this remote mountainous area, the perception of American and British people as "brutes" has taken root, due to the deaths and injuries among the villagers' relatives. A elementary schoolgirl named Eiko transfers from the city of Yokohama to this village. Eiko happens to have blue eyes from her American father, and her classmates make no attempt to rein in their bullying. Other than Eiko's homeroom teacher Akiko, even the teachers view Eiko the same way that the children do. However, a boy named Kenta views Eiko more with curiosity than with hostility. The children's lives change as the injured father of one of Kenta's classmates returns from the battlefield and news of more casualties arrives in the village.

Segua Kingdom has been losing the war against Ninterdo Empire but the tables are turned by the appearance of a boy called Gear. All the characters are parodies of Nintendo or Sega games such as Sonic the Hedgehog, Super Mario Bros., The Legend of Zelda etc.

Segua Kingdom has been losing the war against Ninterdo Empire but the tables are turned by the appearance of a boy called Gear. All the characters are parodies of Nintendo or Sega games such as Sonic the Hedgehog, Super Mario Bros., The Legend of Zelda etc.

An ocean city, Tristia. Tristia used to be prospering playing an important role of the maritime trade, and it was as beautiful as to be praised as "marine jewelry". However, that was a long time ago. The attack of the dragons deprived the city of their original brightness. The people in Tristia worked hard to reconstruct their city, but everything they did went wrong, and the city became desolated on the contrary. At the end of their hope, they asked a Great Artisan for the recovery of the city, Prospero Flanka. Prospero was a legendary inventor who had revived cities that otherwise would have been ruined. The long-awaited day came when the Great Artisan Prosper arrived in the city... However, it was only one girl who stood at the port of the city. Prospero sent his grand daughter, Nanoka, for him.

Toshihiko “Toshi” Tanaka joined the same soccer club that his idol, Yoshiharu Kubo plays for at Kakegawa High School. When Toshi played in junior high with two of his friends Kenji Shiraishi and Kazuhiro Hiramatsu, they were known as the Kakenishi golden trio. Now in high school, his friends do not want or cannot play soccer anymore. Hiramatsu is f… more Toshihiko “Toshi” Tanaka joined the same soccer club that his idol, Yoshiharu Kubo plays for at Kakegawa High School. When Toshi played in junior high with two of his friends Kenji Shiraishi and Kazuhiro Hiramatsu, they were known as the Kakenishi golden trio. Now in high school, his friends do not want or cannot play soccer anymore. Hiramatsu is forced to study by his father so that he would become a respectable adult. However, Hiramatsu loves soccer and wants to play so he confronted his father and says that he wants to play soccer with his friends and that he would never understand his love for soccer. It turns out that his father played soccer during his youth and, remembering how much he loved it, decides to let Hiramatsu play soccer but under the condition that he will keep his grades up as well. Shiraishi on the other hand quit soccer because he lost his temper and got into a fight that ended up disqualifying their team. In the end, he joins the Kakegawa High School soccer club because he loves soccer and playing in the golden trio.

Frankfurt Youth team (Kubo's team while he was in Germany) comes to Japan to play a series of friendly matches. Frankfurt Captain Rudy wanted to see why Kubo left Germany to form a team in Japan so he challenges Kakegawa High to a match.

In the story, a Fleet of Fog loaded with super weapons suddenly appear all over the world. Without the ability to withstand this fleet, humanity was defeated and could no longer travel the seas. 17 years after the devastating naval war, Chihaya Gunzou and his friends somehow commandeer a Fleet of Fog submarine and rename it I-401. Together with Iona, they take on the Fleet of Fog.

Second movie of Aoki Hagane no Arpeggio: Ars Nova which will be an entirely brand-new work.

The first movie will be a compilation of 2013's television anime series with new story sequences, while the second movie will be an entirely brand-new work.

N/A

The Layzner OVA serves as an alternative version of the TV series. The first episode, titled "Eiji 1996", recaps the first part of the series (episodes 01-24). The second episode ("Le Caine 1999") takes place after a time skip, and contains episodes 26 through 37 (episode 25 of the TV series, being a recap itself, is skipped here). The final episode, "Seal 2000", is an expanded version of the final episode of the TV series (38) and features new animation and a longer epilogue.