A gifted obstetrician with hearing loss leads a newly formed emergency rescue team dedicated to saving pregnant women and unborn children who have nowhere else to turn.

Spring 1991. Takaki and Akari meet in elementary school and continue to exchange letters even after she moves away. They make a final promise to each other to meet again. It is now 2008. They live their respective lives, paths never crossing. Enduring memories and a premonition of that promised day. Even now, their words from that day drift quietly, transcending time and distance. An ephemeral story of a promised reunion with someone precious.