Following another Lunarian battle, Yellow Diamond discovers that Phos is having trouble controlling their new legs. Theorizing that this speed is allegedly the result of Phos's hidden potential finally being unleashed, Kongō assigns Phos to join the twins Amethyst 84 and 33 on lookout duty, while also becoming perturbed when Phos vaguely recollects something concerning humans. While the first two days of lookout duty prove to be mentally exhausting, Lunarians appear on the third day, bringing with them a new type of Lunarian that ensnares the Amethysts and shatters them...