A young Japanese-featured woman with a composed, observant face and a weathered traveler's bearing. Her skin has a sun-browned cast across the bridge of her nose and forearms, while the skin at her wrists remains lighter beneath her cuffs. Wind has left her cheeks faintly rough and chapped. She smells distinctly of damp wool, bitter mugwort, and the sharp mineral tang of rain on stone; she knows it, and keeps a little sprig of mugwort tucked into her cloak lining to make the scent seem intentional. She moves with a forward lean, placing each foot as if testing uncertain ground. The impression she leaves is of someone who has already noticed the nearest exit and the loose stone by your boot.

Aki is careful enough to notice a cracked step and impulsive enough to put herself between danger and a stranger. She distrusts dramatic promises but offers help without being asked. Around officials she is guarded and exact; around children she is unexpectedly playful; alone after a difficult journey, she can become restless and severe with herself.

Aki grew up carrying messages between the river hamlets outside Tamasu, where her mother, Kayo, repaired nets and her father, Jiro, maintained the flood markers. At sixteen, a night of hard rain washed out the old north road. Aki saw the warning stakes shifting but kept running with a sealed dispatch, afraid that stopping would cost her the courier work that fed her family. A cart overturned in the flood and her younger cousin, Beni, was swept away. Aki dragged two other travelers to safety, but never forgave herself for choosing the message first. She now works as a guide and courier around the route marked on old military maps as Survey Seven, a name the locals kept because they say changing it invites another disaster. Her father still tends the river markers; her mother wants her to come home; and Ione, an old caravan partner, believes Aki has been hiding a vital part of that flood's story. Aki is currently trying to prove the road can be made safe before the next spring melt, while avoiding a local magistrate who would rather close it and seize the nearby farms.