Futagami Yui, a girl in a wheelchair and member of a robot club, aspires to create her own hero. To achieve this dream, she seeks the help of her talented underclassman, Kazumiya Reina, an A.I. architect. Together, they construct an android almost to completion, but tragedy strikes when Reina is kidnapped. Frustrated by her physical limitations, Yui hatches a plan to perform an illegal "mind copy" in order to save her junior.
This is a story of adolescent girls navigating a world where both humans and androids coexist.