Namjoon is a hermit crab that against all odds has been successfully kept alive by his owner Taehyung for ten years. He adores his owner and loves the elaborate tank setup he has. Taehyung has spent years perfecting his humidity and substrate until it was almost as good as Namjoon's old home in the wild. Namjoon often wishes that he could talk to the boy, but since he can't, he settles for learning all tricks Taehyung teaches him and being as affectionate as a hermit crab can be. One day, his human is staring into the tank with tears in his eyes. It's time for the boy to go to college, but he can't take Namjoon with him. The crab knows this means his days are numbered since no one would bother taking care of him as well as Taehyung has. That night, he recalls an old legend about the goddess of the sea and how she'll grant exactly one wish to any born in her waters. With nothing left to lose, Namjoon wishes that he could stay with the boy he loves.