Soshi has had a crush on Riiko since they were both children, though he has never found the nerve to confess his real feelings and instead teases her. His father is a photographer who travels around the world, so Soshi lives alone with his brother, Masaki. Since Riiko lives alone at the beginning of the series as well, Soshi has promised her mother to protect her. He is a very good cook and usually gives Riiko food when he suspects she needs it.