The changes that occurred in the sea affected the fate of a country called Miello. The introverted hearing-impaired girl Kuroki Yuko and her best friend Natsume Nako encountered a man-eating monster on the way home from school. In a life-and-death crisis, Yuko was parasitized by Kaiyu, a parasitic life, but did not lose consciousness. This opened up the pain and growth of finding oneself.
Concept: the relationship between the collective and the self