When Ventricosus the sea snail suggests that sea creatures may have much needed answers, Pho and Cinnabar head to sea to find a less lonely job for Cinnabar. But the two are not built for the sea and experience danger and hardship.
Two hundred years after an attack on the Lustrous, Phosphophyllite tries to get Kongo to pray for the Lunarians again, and the Lunarians ready themselves to pass into nothingness. The gemstones prepare for life alone on the moon, and Euclase wakes up.
Crystalline lifeforms called The Lustrous fight for their way of life against Lunarians who want to use them for decorations. The oldest among them, Phosphophyllite, wants to join the battle, but is instead ordered to complete a natural history of the gems. And while initially disappointed, Pho makes a new friend in an isolated gem named Cinnabar.
Trapped within an undersea cave with Umi, Ruka begins hearing a strange voice that she eventually discovers is the key to determining the next stage in her journey.
After turning into a snakelike monster that terrifies both humans and ghouls, Kaneki's fate is in the hands of the ghouls and CCG who can't decide if they trust each other enough to work together.
Due to Ainz's kindness, Sebas is able to maintain his loyalty to his master and stay by Tsuare's side, but he wonders if he will be able to keep Tsuare safe from dangers in the game.
Unglaus and Climb witness a fight involving an old man who turns out to be Sebas. Their journeys converge as Unglaus looks to discover the reason he fights, Climb trains to become stronger, and Sebas wants to find a way to keep safe a girl he has sworn to protect.
With the start of the new year getting closer, the girls wonder where they should go to see the first sunrise of the year. As they examine their choices, the girls experience camping, relaxing, exploring, and eating.
The Outdoor Exploration Club goes camping on Christmas break, but along with familiar faces, the group brings in some greehorns and a new club adviser. As the girls enjoy the outdoors, they begin to wonder what the perfect Christmas meal is to compliment their adventure.
