The first half of the story centers around Allison Whittington, a young blonde pilot in the Roxche Air Force who has experience with biplanes. She comes to visit her good friend Wil Schultz  during his summer vacation at Rowe Sneyum Senior School's dormitory after being away for six months. The two get involved in three different adventures over a period of a year where they meet new people and form important bonds.

The first half of the story centers around Allison Whittington, a young blonde pilot in the Roxche Air Force who has experience with biplanes. She comes to visit her good friend Wil Schultz  during his summer vacation at Rowe Sneyum Senior School's dormitory after being away for six months. The two get involved in three different adventures over a period of a year where they meet new people and form important bonds.

The second half of the story starts about fifteen years after the conclusion of the first half. The story centers around Lilliane Schultz, or Lillia for short, the daughter of Allison and Wil. Wil has in this time assumed a new identity, Travas, under the Sou Beil military, though still dates Allison. Lillia's companion is her childhood friend Treize, son of Carr Benedict and Fiona; Treize has a twin sister named Merielle. Lillia's and Treize's adventure together begins during her summer vacation from school.

Allison & Lillia’s story covers the storys of the Roxcheanuk Confederation, and the United Kingdom of Bezel Iltoa.