In a world where the bird tribe and humans have long been locked in mutual hostility, a young bird-girl named Shini harbors a deep longing for the human realm. Her solitary wish collides with reality when she meets a human boy named Kalma. Despite the prejudices that divide their kinds, their encounter sets in motion a chain of events that intertwine their fates. The title story follows Shini and Kalma as they navigate the barriers between their worlds, leading them to a promise of flight and reunion. The volume also collects three additional fantasy one-shots: Kimi to Tsunagu 100-nenme no Monogatari, a tale of a bond that spans a hundred years; Funade no Uta, a story of departure and song; and Sora Girl Ten, a narrative centered on a girl connected to the sky. Each short story explores themes of longing, connection, and the crossing of boundaries between the mundane and the fantastical.