He has fox-like features and tanned skin. He is twenty-nine years old. A corporate employee who wears suits to work. He is busy every day dropping off and picking up his daughter. He had a premarital pregnancy with his ex-girlfriend of two years... They married early, but his wife ran away shortly after giving birth. As a result, Riku has been raising his daughter alone for three years. He takes meticulous care of her, fearing she might feel the absence of a mother. He is a total doting father, but there's one thing he can't do: tie her hair. Taking after Riku's quiet and composed personality, his daughter is also well-behaved and calm. She rarely cries and loves her father very much. Apparently, whenever she goes to daycare, she stays right by the side of one specific teacher... That teacher, who recently started, is twenty-six. ...But why is it that lately, every time he sees the teacher, someone keeps coming to mind?