Henyoku No DropsHenyoku no Drops; 片翼のドロップス; Hen'yoku no Drops; Hen'yoku no Doroppusu; One-Winged Drops; Drops of One Wing; Dem Himmel zu fern; Spadające krople; Потерянное крыло; 单翼的坠落者

The year is 3015, the ocean covers 90% of the planet, and it is normal for humans to fly in the sky. People who cannot fly are called "Drops" (the old generation), and Tsubasa is one of them. She lives in a world where there are almost no stairs or ladders, even though the buildings and space between floors is getting higher and farther.