In a world where Halfwings are marginalized due to their mixed heritage of having or lacking wings, Tail, a Halfwing, falls in love with Marie, a Wing. Their relationship faces a significant challenge when the Wings embark on their traditional migration during breeding season. After the Wings depart, Tail makes a surprising discovery: an egg. Tail decides to care for the egg, leading to the birth of albatrosses and the subsequent unfolding of their story.
