Aboard the Edens Zero, a lonely boy with the ability to control gravity embarks on an adventure to meet the fabled space goddess known as Mother.

A secret life is the one thing they have in common. At school, Hori is a prim and perfect social butterfly, but the truth is she's a brash homebody. Meanwhile, under a gloomy facade, Miyamura hides a gentle heart, along with piercings and tattoos. In a chance meeting, they both reveal a side they've never shown. Could this blossom into something new?