Erika and Akino awaken in a vast, unfamiliar fortress after their sudden arrival in the strange dimension. Accused by stern soldiers of aiding a hostile nation, the longtime friends must answer probing questions while adjusting to their guarded surroundings. As they search for any sign of an exit, the pair draws strength from their shared history, even as the rules of this new realm grow increasingly unclear. Their determination to return home is tested at every turn by the soldiers’ watchful presence.