Young, free and madly in love. As teenagers, the world was their oyster but as adults, their lives seem dimmer, like a very important piece is missing.

A young couple who meet their first love in the late 1990's, grow up in the 2000's, and ultimately lead up to the present day as they discover what had made their relationship unforgettable despite the twenty-something years that have passed. Mitsushima, who is acclaimed for her subtle yet bold performances, will play Yae Noguchi, an aspiring flight attendant who finds out that fate has other plans for her when she is struck by a tragic accident in the midst of realizing her dreams. Satoh, who has demonstrated tremendous range in performances ranging from action to romance, will play the earnest Harumichi Namiki, who was at one time a pilot for the self-defense forces, but no longer pursuing that career path.