Legends of Heroes: The Miserable Sinners

In the southwest area of the Zemulia Continent, one will find the tiny Liberl Kingdom. A small monarchy that has managed to defy all odds against attempts to overcome them during war. Liberl is split into five regions: Rolent, Bose, Ruan, Zeiss, and Grancel. In the city of Rolent, Cassius Bright has raised two children by himself, Estelle and Joshua. He taught them everything they know himself, and encourages them to sign up to become apprentices in the Bracers Guild. Soon after, however, he receives a letter and has to leave on business, leaving Estelle and Joshua to fend for themselves. While working, they receive notice one day that their father's airship has gone missing. With this in mind, the two gear themselves up, and set off to find the ship and save their father. (Source: Sora no Kiseki Translation Project)

Based on the RPG game by the same title. The game takes place in the Erebonian Empire within the same time frame as Zero no Kiseki and Ao no Kiseki. The game's plot is centered around the newly formed special class "Class VII" in Thors Military Academy, composed of both aristocrats and common Erebonian citizens. Class VII is the only class in the entire academy that does not segregate the two different social classes. The game follows Class VII throughout their school year, mainly around the times when Class VII receives special field training that takes them all over Erebonia. Throughout their training across Erebonia, Class VII matures and casts aside their preconceptions of the two social classes as well witness first hand the reality of empire; the power struggle between the aristocracy led by the four noble houses, and the working class reformists led by Iron Blood Chancellor of Erebonia, Giliath Osborne which threatens to lead to a civil war.