She is the one of the main character of the series. She is a glamorous young teacher, who is a new homeroom teacher at Arama Academy. She is very kind-hearted and always helpful to her students, among whom she is very popular. The boys take delight in lifting up her skirts and devising traps to catch her in various stages of undress. She has been described as having 'the perfect proportions'. Machiko understands that the boys only play pranks on her because they like her, and laughs them off by saying "Maicchingu!" {meaning "How embarrassing".} In the series, her skirt is often lifted up by the boys to see her knickers, who also take delight in peeking while she is bathing. There are many scenes in which her clothes are shown torn up, where her breasts and butt are clearly visible. In the show, her bras, knickers, breasts, and butt are shown.