He comes from Santana town and studies in middle school. During summer holiday Nagasumi and his family visit his grandmother. There he almost drowns in the sea. Michishio is saved by the mermaid San, and that day changes his entire life. In order to save his own life and his family, he has to marry San. But this won’t be an easy task, because her father is ready to do anything, to kill him. Michishio gets his first kiss from Masa, one of Seto family’s bodyguards. There are so many new problems Nagasumi has to deal with. Very often he gets into troubles and gets beaten up by anyone. But he likes San and does everything possible to stay with her. I must say that Michishio has very strong inner self. In many of the dangerous situations he gets involved in, shows incredible courage and strength.