A space colony teen's life changes when she befriends a refugee and joins underground mecha duels. Her world is further shaken by the arrival of a mysterious Gundam and its young pilot, both sought by authorities.

Sport climbing is a sport that makes use of both the body and the brain to climb walls. Kasahara Konomi, a master at puzzles, just happens to discover her school’s climbing wall, and it looks almost like a colorful sort of puzzle in her eyes. This fateful encounter brings big changes to Konomi’s life! With her teammates in the Hanamiya Girls’ High School Climbing Club, Konomi races for the top in this passionate climbing story!

Inside a vast, self-replicating city bent on eliminating all life, mysterious loner Killy emerges to guide a remnant of humanity desperate to survive.