Yorito is a high school student who finds pleasure in capturing pictures of the sky. His unexpected encounter with Matsuri proves to be exceptional as she is a Yaka, a timeless creature who must evade sunlight. Despite living alone for most of her life, Matsuri eventually befriends Yorito, who becomes her first companion.
Nonetheless, Matsuri's genuine nature as a Yaka holds more complexity than meets the eye. Takeshi, a man armed with a sword, emerges as a foe with intentions to harm Matsuri, and the reason behind it remains a mystery.
As a supernatural battle looms, Yorito faces the challenge of safeguarding his friendship with Matsuri at all costs. Will he possess the bravery to do so?
