Kunisaki Yukito is a traveller, ever seeking the girl in the sky from a legend passed down in his family. His journey takes him to a small seaside town, where he meets Misuzu, a girl who seems eager to become his friend. A story spanning a thousand years begins to unfold against the background of their peculiar relationship.

[Source: AnimeNfo]

"The days which are wrapped in the scene of summer pass gently by. An encounter with the girls repeated in the sunlight. Summer continues. She is waiting in the air."

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.

[Source: Anime News Network]

An extension of the summer-arc in the Air TV-series, showing more of what happened during Kanna's, Ryuya's and Uraha's journey to find Kanna's mother.

――This is the story of a small miracle.
Stars from different universes and different times that were never meant to cross paths. By irony of fate, these stars come together in “Kaginado Academy”.
What awaits them there is a lively school life full of hope and dreams.
The wonderful encounters provide the stars with new radiance.
What awaits beyond that radiance...?

[Source: official website]