A thousand years ago, he burned the elixir of immortality on the highest peak in Japan, refusing to live in a world without her. Today, Kazuto Yuuki is just a tired college student working the night shift at a convenience store—until a girl with celestial eyes and a 10th-century vocabulary walks into his life.

Asuna Kurumo is "clueless" about smartphones and subway maps, but she knows exactly who Kazuto is. She has escaped the cold silence of the Moon to find her Emperor one last time. But the Lunar Capital doesn't forget a debt, and for every moment Asuna spends in the arms of a mortal, her soul begins to turn to dust.

Can Kazuto rewrite a tragedy a millennium in the making, or is the Moon destined to take her back again?