In Eureka Seven: AO, Quartz is formed by the Scub Coral to travel to different timelines to escape the Limit of Questions from Eureka Seven. With the Quartz, time and space are the same thing for the Scub Coral. Ten years prior to the series beginning, Eureka was working for the American Forces by removing the Quartz in order to destroy the Scub Coral and protect her son, Ao. However, when a Secret appeared, Eureka merged with the Quartz and attempted to transport it to another universe, but because she wasn't specific enough on where to go, she ended up in limbo between worlds. Ao later joins Generation Bleu in order to find her and takes part in collecting the Quartz. He eventually receives the Quartz Gun, which can be used by collecting a large amount of Quartz.