|“||Name's Harumi Taniguchi, you can call me "Harumin".||”|
Harumi is a young girl with long plum (dark auburn in the anime) hair and hazel eyes. Her hair is styled in perfectly straight bangs that cover her forehead, with somewhat longer bangs on the sides of her head and ears. She usually wears her hair tied in a ponytail on the bottom of her head, but sometimes wears her hair loose or even in twintails, which are low-tied and usually fall over her shoulders. She also has a rather big chest, where she hides stuff banned by the school regulations, like makeup and her cellphone.
Harumi is a humorous, kind and easy-going girl, and a good friend to Yuzu. She has a similar mentality to Yuzu and enjoys doing things which are prohibited by her school's regulations. She better describes herself as a "gyaru in disguise".
She usually avoids trouble. According to Matsuri, that is because she's afraid of being hurt.
- "Harumi" can have different meanings depending on the writing, such as 晴海 ("cloudy sea"?) or 春美 ("spring beauty"?). Harumi's name, however, has no actual meaning as it's written in Hiragana. "Taniguchi" (谷口?) means "mouth of a valley".
- "Mineko's Room" is a reference to "Tetsuko's Room", a popular Talk Show hosted by Tetsuko Kuroyanagi, and to the teacher Mineko.
- "In the manga, she appears to be unaware of Yuzu and Mei's relationship, but in the Drama CD she is shown to be fully aware, purposely stopping Himeko from getting in their way.