This coming-of-age story follows Coni, a mechanical engineer, who creates robots called Mechas to help humanity alongside her companion B1U3 – a Mecha she created in her own image. One day, she gets a sudden warning that all Mechas have started to malfunction and scattered around in the testing grounds of the lab. Coni sets out to find out what happened, fix the malfunctioning Mechas, and bring them back