Nagamori Tomoka is selected as Choco's 'companion', tasked with safeguarding the planet from colossal creatures. During her duties, she encounters a unique 'girl' – a robot who goes by the name Choco. Despite her artificial nature, Choco designates Tomoka as her 'companion'. As they interact, Choco raises a profound query about the concept of friendship, prompting Tomoka to ponder its significance. With mesmerizing eyes and an enigmatic aura, Choco stands out as a being even more extraordinary than a giant robot. Thus begins the extraordinary encounter between Choco and Tomoka.