Toaru Hikuushi e no Tsuioku

In a war divided by both national borders and social rank, skilled pilot Charles Karino is given a secret assignment: carry the future empress Fana across enemy-controlled waters to her fiancé. Their small reconnaissance seaplane offers little protection against the forces searching for them.

Alone together above the sea, the disregarded mercenary and the sheltered noblewoman begin to see each other beyond the roles imposed on them. Charles must keep Fana alive through a perilous flight, knowing that delivering her safely also means returning her to a world that keeps them apart.