I think you've lost if you fall in love.
​—Hinooka Homura. Seiran High School 1st year.
Without fully understanding what she was getting herself into, Homura soon finds herself and Touya joining up with the Exploration Club president, a Yamato Nadeshiko named Misasagi Mayo, and a magically powered golem/android named Ameno in order to explore a recently discovered sister planet to Earth named Nutella. Nutella is enormous in size, easily dwarfing Jupiter, and yet somehow it is mysteriously and magically linked with Earth.