He usually refers to her as his son, which incurs his daughter's wrath. This conflict, caused by the fact that she wants to be more feminine, leads to constant fights, one of which destroyed Hamachiya and left them homeless. When Ryuunosuke enrolled at Tomobiki High, he took charge of the school store where they both live. On a side note, he is inspired almost entirely by the sea. If he gets too motivated, he shouts "I LOVE THE SEA!!" ("UMI GA SUKI!!"). He also has a habit of lying to Ryuunosuke about anything to suit his own needs or desires, such as saying that the misaki mushroom was poisonous so he could eat it, or put a paralisis in Ryuunosuke food. While growing up, she had no reason to doubt him, so she always believed him; now that she's older (and is actually associating with people other than her father) she is learning that many things he said were lies, and knows better than to believe him about almost anything. The thing he lies about most is his wife, only willing to say general things like "she was beautiful", but never giving any real information; this is a difficult thing for Ryuunosuke to try to counter, regardless of age, since she sincerely wants to know about her mother, leading her to often fall for some trick at the hands of her father. However, it is possible that he has forgotten what she looks like altogether.