One year after the events of the anime, Rintarou begins to feel the repercussions of extensive time travel, and eventually completely fades from reality. Kurisu, being the only companion to remember him, now must find a way to bring him back.
A long time ago, a winged maiden was held prisoner in a castle - cursed never to experience love, lest she die. Centuries later, in a sleepy coastal town, a young girl relives this agony.
