A transfer student in Class 2-4 at Tomobiki High School. Although she is a girl, her father insists that the successor to the Hamachaya must be male, so he raises Ryuunosuke as a boy and maintains that she is one. Because her eccentric father raised her as a boy to run the Hamachaya, she behaves much like one and is quite violent. However, since she is actually a girl, she hates being treated like a boy. She would love nothing more than to let her feminine side show, but her father interferes in every attempt she makes. Her first love was her elementary school teacher, whom she later realizes was a woman. Only Ataru Moroboshi truly treats her like a woman, but she handles it the same way most girls handle Ataru: with a hard left hook, not that it ever stops him.
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