Tsumugu Kihara

A boy from the surface and the grandson of Isamu Kihara (a fisherman). One day, he meets Manaka Mukaido when she is caught in his net. He is quiet, stoic, and very interested in the underwater world. His grandfather was from the sea. Tsumugu has a complicated relationship with his mother. After the time skip, he attends college and majors in oceanography. He lives in the city and conducts research about the sea villages at his university. He becomes close to Chisaki Hiradaira and he eventually falls in love with her. After accidentally claiming his love for Chisaki, he follows her into the sea and gains Ena. It is later revealed that he had known of Manaka's feelings for Hikari Sakishima since the eve of the Ofunehiki five years previously, but agreed to keep it a secret at Manaka's request. After having a talk with Kaname about Chisaki's true feelings, Chisaki finally accepts her love for Tsumugu and they become a couple. He is last seen walking to the train station with Chisaki as he leaves for college. He is not very good at expressing himself and others therefore consider him emo. He constantly got bullied as a kid because of his fishing addiction and therefore only shares his interests with those he is close too.