Naru is a 13-year-old girl and one of Ao Fukai's neighbors. She requires oxygen therapy due to an accident in the past involving a Scub Burst and the mysterious Sea Giant, but she somehow became a Yuta, a psychic in Okinawan folklore, as a result. She lives with her grandmother, father Mitsuo, and sister Miyu, due to the death of her mother several years ago during the Scub Burst event. She has a pet Iriomote three-toed sloth named Noah whom she entrusts to Ao when he decides to join Team Pied Piper. It would appear that Naru has become a priestess of the Scub Corals. It is hinted that she has feelings for Ao.