The year is 3015. Humanity has evolved to "fly". Except for her, Tsubasa Shinkai, the only girl around who cannot fly, what people call a "Drop," Because of this, her life has been a complete disaster. Tsubasa wants to reset her past, but on her first day at her new school, her "inability to fly" is revealed to Ren Takatsuki, another transfer student! Their encounter will change the fate of the human race...!

(Source: Manga Park, translated)